diff --git a/HOWTO.INSTALL b/HOWTO.INSTALL
index 6cf31c0..2ae3fbb 100644
--- a/HOWTO.INSTALL
+++ b/HOWTO.INSTALL
@@ -198,7 +198,7 @@ Installing calc from the bzip2-ed tarball in 4 easy steps:
 We suggest that you might want to read the README.FIRST file and look at
 the calc help subsystem.  See also the README.md file.
 
-## Copyright (C) 1999-2007  Landon Curt Noll
+## Copyright (C) 1999-2007,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/blkcpy.c b/blkcpy.c
index f73b86f..9fea67f 100644
--- a/blkcpy.c
+++ b/blkcpy.c
@@ -1,7 +1,7 @@
 /*
  * blkcpy - general values and related routines used by the calculator
  *
- * Copyright (C) 1999-2007  Landon Curt Noll and Ernest Bowen
+ * Copyright (C) 1999-2007,2021  Landon Curt Noll and Ernest Bowen
  *
  * Primary author:  Landon Curt Noll
  *
diff --git a/block.c b/block.c
index 4e2e9f7..dfbde07 100644
--- a/block.c
+++ b/block.c
@@ -1,7 +1,7 @@
 /*
  * block - fixed, dynamic, fifo and circular memory blocks
  *
- * Copyright (C) 1999-2007  Landon Curt Noll and Ernest Bowen
+ * Copyright (C) 1999-2007,2021  Landon Curt Noll and Ernest Bowen
  *
  * Primary author:  Landon Curt Noll
  *
diff --git a/block.h b/block.h
index 1b14851..128e3fd 100644
--- a/block.h
+++ b/block.h
@@ -1,7 +1,7 @@
 /*
  * block - fixed, dynamic, fifo and circular memory blocks
  *
- * Copyright (C) 1999-2007,2014  Landon Curt Noll and Ernest Bowen
+ * Copyright (C) 1999-2007,2014,2021  Landon Curt Noll and Ernest Bowen
  *
  * Primary author:  Landon Curt Noll
  *
diff --git a/byteswap.c b/byteswap.c
index f4c75a7..2f51983 100644
--- a/byteswap.c
+++ b/byteswap.c
@@ -1,7 +1,7 @@
 /*
  * byteswap - byte swapping routines
  *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/Makefile b/cal/Makefile
index 3862d14..6106883 100644
--- a/cal/Makefile
+++ b/cal/Makefile
@@ -2,7 +2,7 @@
 #
 # cal - makefile for calc standard resource files
 #
-# Copyright (C) 1999-2006,2017  Landon Curt Noll
+# Copyright (C) 1999-2006,2017,2021  Landon Curt Noll
 #
 # Calc is open software; you can redistribute it and/or modify it under
 # the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/alg_config.cal b/cal/alg_config.cal
index 6f13f82..2801755 100644
--- a/cal/alg_config.cal
+++ b/cal/alg_config.cal
@@ -1,7 +1,7 @@
 /*
  * alg_config - help determine optimal values for algorithm levels
  *
- * Copyright (C) 2006,2014  Landon Curt Noll
+ * Copyright (C) 2006,2014,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/bernoulli.cal b/cal/bernoulli.cal
index 0f1ce98..a6ed208 100644
--- a/cal/bernoulli.cal
+++ b/cal/bernoulli.cal
@@ -1,7 +1,7 @@
 /*
  * bernoulli - calculate the Nth Bernoulli number B(n)
  *
- * Copyright (C) 2000  David I. Bell and Landon Curt Noll
+ * Copyright (C) 2000,2021  David I. Bell and Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/bernpoly.cal b/cal/bernpoly.cal
index 2d23534..8911abb 100644
--- a/cal/bernpoly.cal
+++ b/cal/bernpoly.cal
@@ -1,7 +1,7 @@
 /*
  * bernpoly - Bernoulli polynomials B_n(z) for arbitrary n,z..
  *
- * Copyright (C) 2013 Christoph Zurnieden
+ * Copyright (C) 2013,2021 Christoph Zurnieden
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/brentsolve.cal b/cal/brentsolve.cal
index 146a79f..32f81f4 100644
--- a/cal/brentsolve.cal
+++ b/cal/brentsolve.cal
@@ -1,7 +1,7 @@
 /*
  * brentsolve - Root finding with the Brent-Dekker trick
  *
- * Copyright (C) 2013 Christoph Zurnieden
+ * Copyright (C) 2013,2021 Christoph Zurnieden
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/chi.cal b/cal/chi.cal
index 602ec76..72a80b3 100644
--- a/cal/chi.cal
+++ b/cal/chi.cal
@@ -1,7 +1,7 @@
 /*
  * chi - chi^2 probabilities with degrees of freedom for null hypothesis
  *
- * Copyright (C) 2001  Landon Curt Noll
+ * Copyright (C) 2001,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/chrem.cal b/cal/chrem.cal
index 280b7c2..aeb9581 100644
--- a/cal/chrem.cal
+++ b/cal/chrem.cal
@@ -1,7 +1,7 @@
 /*
  * chrem - Chinese remainder theorem/problem solver
  *
- * Copyright (C) 1999  Ernest Bowen and Landon Curt Noll
+ * Copyright (C) 1999,2021  Ernest Bowen and Landon Curt Noll
  *
  * Primary author:  Ernest Bowen
  *
diff --git a/cal/dms.cal b/cal/dms.cal
index 9a35610..bb85d36 100644
--- a/cal/dms.cal
+++ b/cal/dms.cal
@@ -1,7 +1,7 @@
 /*
  * dms - calculate in degrees, minutes, and seconds (based on deg)
  *
- * Copyright (C) 1999,2010  David I. Bell and Landon Curt Noll
+ * Copyright (C) 1999,2010,2021  David I. Bell and Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/factorial2.cal b/cal/factorial2.cal
index c74473f..bac739e 100644
--- a/cal/factorial2.cal
+++ b/cal/factorial2.cal
@@ -1,7 +1,7 @@
 /*
  * factorial2 - implementation of different factorial related functions
  *
- * Copyright (C) 2013 Christoph Zurnieden
+ * Copyright (C) 2013,2021 Christoph Zurnieden
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/hms.cal b/cal/hms.cal
index 33255b7..5bb1fdf 100644
--- a/cal/hms.cal
+++ b/cal/hms.cal
@@ -1,7 +1,7 @@
 /*
  * hms - calculate in hours, minutes, and seconds
  *
- * Copyright (C) 2010  Landon Curt Noll
+ * Copyright (C) 2010,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/intfile.cal b/cal/intfile.cal
index e30b420..14da608 100644
--- a/cal/intfile.cal
+++ b/cal/intfile.cal
@@ -1,7 +1,7 @@
 /*
  * intfile - integer to file and file to integer conversion
  *
- * Copyright (C) 2001  Landon Curt Noll
+ * Copyright (C) 2001,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/intnum.cal b/cal/intnum.cal
index 5796de7..befff66 100644
--- a/cal/intnum.cal
+++ b/cal/intnum.cal
@@ -1,7 +1,7 @@
 /*
  * intnum - implementation of tanhsinh- and Gauss-Legendre quadrature
  *
- * Copyright (C) 2013 Christoph Zurnieden
+ * Copyright (C) 2013,2021 Christoph Zurnieden
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/lambertw.cal b/cal/lambertw.cal
index 49a1c7b..9ac6e5d 100644
--- a/cal/lambertw.cal
+++ b/cal/lambertw.cal
@@ -1,7 +1,7 @@
 /*
  * lambertw - Lambert's W-function
  *
- * Copyright (C) 2013 Christoph Zurnieden
+ * Copyright (C) 2013,2021 Christoph Zurnieden
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/linear.cal b/cal/linear.cal
index 8b7ae07..507e1f4 100644
--- a/cal/linear.cal
+++ b/cal/linear.cal
@@ -1,7 +1,7 @@
 /*
  * linear - perform a simple two point 2D linear interpolation
  *
- * Copyright (C) 2005-2007  Landon Curt Noll
+ * Copyright (C) 2005-2007,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/lucas.cal b/cal/lucas.cal
index 7bf3aa4..d9ade2f 100644
--- a/cal/lucas.cal
+++ b/cal/lucas.cal
@@ -1,7 +1,7 @@
 /*
  * lucas - perform a Lucas primality test on h*2^n-1
  *
- * Copyright (C) 1999,2017,2018  Landon Curt Noll
+ * Copyright (C) 1999,2017,2018,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/lucas_chk.cal b/cal/lucas_chk.cal
index 4c39614..aca1a3f 100644
--- a/cal/lucas_chk.cal
+++ b/cal/lucas_chk.cal
@@ -1,7 +1,7 @@
 /*
  * lucas_chk - test all primes of the form h*2^n-1, 1<=h<200 and n <= high_n
  *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/mfactor.cal b/cal/mfactor.cal
index 007a9b8..f4893b2 100644
--- a/cal/mfactor.cal
+++ b/cal/mfactor.cal
@@ -1,7 +1,7 @@
 /*
  * mfactor - return the lowest factor of 2^n-1, for n > 0
  *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/natnumset.cal b/cal/natnumset.cal
index 48d66ef..3cfa310 100644
--- a/cal/natnumset.cal
+++ b/cal/natnumset.cal
@@ -1,7 +1,7 @@
 /*
  * natnumset - functions for sets of natural numbers not exceeding a fixed bound
  *
- * Copyright (C) 1999  Ernest Bowen
+ * Copyright (C) 1999,2021  Ernest Bowen
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/pell.cal b/cal/pell.cal
index a09b4de..1011e9f 100644
--- a/cal/pell.cal
+++ b/cal/pell.cal
@@ -1,7 +1,7 @@
 /*
  * pell - solve Pell's equation
  *
- * Copyright (C) 1999  David I. Bell
+ * Copyright (C) 1999,2021  David I. Bell
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/poly.cal b/cal/poly.cal
index 1048026..f4029ac 100644
--- a/cal/poly.cal
+++ b/cal/poly.cal
@@ -1,7 +1,7 @@
 /*
  * poly - calculate with polynomials of one variable
  *
- * Copyright (C) 1999  Ernest Bowen
+ * Copyright (C) 1999,2021  Ernest Bowen
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/prompt.cal b/cal/prompt.cal
index 288c5d1..1bc9044 100644
--- a/cal/prompt.cal
+++ b/cal/prompt.cal
@@ -1,7 +1,7 @@
 /*
  * prompt - demonstration of some uses of prompt() and eval()
  *
- * Copyright (C) 1999  Ernest Bowen
+ * Copyright (C) 1999,2021  Ernest Bowen
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/quat.cal b/cal/quat.cal
index 05202d4..7ab3438 100644
--- a/cal/quat.cal
+++ b/cal/quat.cal
@@ -1,7 +1,7 @@
 /*
  * quat - calculate using quaternions of the form: a + bi + cj + dk
  *
- * Copyright (C) 1999  David I. Bell
+ * Copyright (C) 1999,2021  David I. Bell
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/randmprime.cal b/cal/randmprime.cal
index ec36ae1..5e2a981 100644
--- a/cal/randmprime.cal
+++ b/cal/randmprime.cal
@@ -1,7 +1,7 @@
 /*
  * randmprime - generate a random prime of the form h*2^n-1
  *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/regress.cal b/cal/regress.cal
index 193dc68..a0d0043 100644
--- a/cal/regress.cal
+++ b/cal/regress.cal
@@ -1,7 +1,7 @@
 /*
  * regress - calc regression and correctness test suite
  *
- * Copyright (C) 1999-2017  David I. Bell and Landon Curt Noll
+ * Copyright (C) 1999-2017,2021  David I. Bell and Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/specialfunctions.cal b/cal/specialfunctions.cal
index 3f8f334..898c90a 100644
--- a/cal/specialfunctions.cal
+++ b/cal/specialfunctions.cal
@@ -1,7 +1,7 @@
 /*
  * specialfunctions - special functions (e.g.: gamma, zeta, psi)
  *
- * Copyright (C) 2013 Christoph Zurnieden
+ * Copyright (C) 2013,2021 Christoph Zurnieden
  *
  * Calc is open software; you can redistribute it and/or modify
  * it under the terms of the version 2.1 of the GNU Lesser General Public
diff --git a/cal/statistics.cal b/cal/statistics.cal
index ce488f4..1278b1f 100644
--- a/cal/statistics.cal
+++ b/cal/statistics.cal
@@ -1,7 +1,7 @@
 /*
  * statistics - Some assorted statistics functions.
  *
- * Copyright (C) 2013 Christoph Zurnieden
+ * Copyright (C) 2013,2021 Christoph Zurnieden
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/test2600.cal b/cal/test2600.cal
index c459c27..4771022 100644
--- a/cal/test2600.cal
+++ b/cal/test2600.cal
@@ -1,7 +1,7 @@
 /*
  * test2600 - 2600 series of the regress.cal test suite
  *
- * Copyright (C) 1999  Ernest Bowen and Landon Curt Noll
+ * Copyright (C) 1999,2021  Ernest Bowen and Landon Curt Noll
  *
  * Primary author:  Ernest Bowen
  *
diff --git a/cal/test2700.cal b/cal/test2700.cal
index e1e85e7..57239cf 100644
--- a/cal/test2700.cal
+++ b/cal/test2700.cal
@@ -1,7 +1,7 @@
 /*
  * test2700 - 2700 series of the regress.cal test suite
  *
- * Copyright (C) 1999  Ernest Bowen and Landon Curt Noll
+ * Copyright (C) 1999,2021  Ernest Bowen and Landon Curt Noll
  *
  * Primary author:  Ernest Bowen
  *
diff --git a/cal/test5100.cal b/cal/test5100.cal
index 56e6c58..4b3df68 100644
--- a/cal/test5100.cal
+++ b/cal/test5100.cal
@@ -1,7 +1,7 @@
 /*
  * test5100 - 5100 series of the regress.cal test suite
  *
- * Copyright (C) 1999  Ernest Bowen and Landon Curt Noll
+ * Copyright (C) 1999,2021  Ernest Bowen and Landon Curt Noll
  *
  * Primary author:  Ernest Bowen
  *
diff --git a/cal/test8500.cal b/cal/test8500.cal
index a6bd736..d4e2f0e 100644
--- a/cal/test8500.cal
+++ b/cal/test8500.cal
@@ -1,7 +1,7 @@
 /*
  * test8500 - 8500 series of the regress.cal test suite
  *
- * Copyright (C) 1999  Ernest Bowen and Landon Curt Noll
+ * Copyright (C) 1999,2021  Ernest Bowen and Landon Curt Noll
  *
  * Primary author:  Ernest Bowen
  *
diff --git a/cal/test8900.cal b/cal/test8900.cal
index c2de2d3..7db4a4d 100644
--- a/cal/test8900.cal
+++ b/cal/test8900.cal
@@ -1,7 +1,7 @@
 /*
  * test8900 - 8900 series of the regress.cal test suite
  *
- * Copyright (C) 2013 Christoph Zurnieden
+ * Copyright (C) 2013,2021 Christoph Zurnieden
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/toomcook.cal b/cal/toomcook.cal
index 2bbb41d..97867bb 100644
--- a/cal/toomcook.cal
+++ b/cal/toomcook.cal
@@ -1,7 +1,7 @@
 /*
  * toomcook - implementation of Toom-Cook(3,4) multiplication algorithm
  *
- * Copyright (C) 2013 Christoph Zurnieden
+ * Copyright (C) 2013,2021 Christoph Zurnieden
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/cal/unitfrac.cal b/cal/unitfrac.cal
index 058410f..75ce5a3 100644
--- a/cal/unitfrac.cal
+++ b/cal/unitfrac.cal
@@ -1,7 +1,7 @@
 /*
  * unixfrac - represent a fraction as a sum of distance unit fractions
  *
- * Copyright (C) 1999  David I. Bell
+ * Copyright (C) 1999,2021  David I. Bell
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/codegen.c b/codegen.c
index b7804cd..93f7f68 100644
--- a/codegen.c
+++ b/codegen.c
@@ -1,7 +1,7 @@
 /*
  * codegen - module to generate opcodes from the input tokens
  *
- * Copyright (C) 1999-2007,2017  David I. Bell and Ernest Bowen
+ * Copyright (C) 1999-2007,2017,2021  David I. Bell and Ernest Bowen
  *
  * Primary author:  David I. Bell
  *
diff --git a/comfunc.c b/comfunc.c
index f3f2e03..52b4f00 100644
--- a/comfunc.c
+++ b/comfunc.c
@@ -1,7 +1,7 @@
 /*
  * comfunc - extended precision complex arithmetic non-primitive routines
  *
- * Copyright (C) 1999-2007  David I. Bell and Ernest Bowen
+ * Copyright (C) 1999-2007,2021  David I. Bell and Ernest Bowen
  *
  * Primary author:  David I. Bell
  *
diff --git a/config.h b/config.h
index 361e8b9..c2c54cd 100644
--- a/config.h
+++ b/config.h
@@ -1,7 +1,7 @@
 /*
  * config - configuration routines
  *
- * Copyright (C) 1999-2007,2014  Landon Curt Noll and David I. Bell
+ * Copyright (C) 1999-2007,2014,2021  Landon Curt Noll and David I. Bell
  *
  * Primary author:  Landon Curt Noll
  *
diff --git a/cscript/piforever.calc b/cscript/piforever.calc
index 4a289ef..3b4d035 100644
--- a/cscript/piforever.calc
+++ b/cscript/piforever.calc
@@ -2,7 +2,7 @@
 /*
  * piforever - print digits of pi forever (or as long as your mem/CPU allow)
  *
- * Copyright (C) 1999-2007,2014,2019  Landon Curt Noll
+ * Copyright (C) 1999-2007,2014,2019,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom.c b/custom.c
index 6bc0114..39259f5 100644
--- a/custom.c
+++ b/custom.c
@@ -1,7 +1,7 @@
 /*
  * custom - interface for custom software and hardware interfaces
  *
- * Copyright (C) 1999-2006,2018  Landon Curt Noll
+ * Copyright (C) 1999-2006,2018,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom.h b/custom.h
index 5ca3939..b8c686a 100644
--- a/custom.h
+++ b/custom.h
@@ -1,7 +1,7 @@
 /*
  * custom - interface for custom software and hardware interfaces
  *
- * Copyright (C) 1999-2007  Landon Curt Noll
+ * Copyright (C) 1999-2007,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom/HOW_TO_ADD b/custom/HOW_TO_ADD
index 5dd5fe7..988c1c7 100644
--- a/custom/HOW_TO_ADD
+++ b/custom/HOW_TO_ADD
@@ -645,7 +645,7 @@ Step 12: Contribute
     and consider submitting your custom function for possible
     inclusion in later versions of calc.
 
-## Copyright (C) 1999-2007  Landon Curt Noll
+## Copyright (C) 1999-2007,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom/c_pmodm127.c b/custom/c_pmodm127.c
index 9887bfc..929fbf8 100644
--- a/custom/c_pmodm127.c
+++ b/custom/c_pmodm127.c
@@ -1,7 +1,7 @@
 /*
  * c_pmodm127 - calculate q mod 2^(2^127-1)
  *
- * Copyright (C) 2004-2007  Landon Curt Noll
+ * Copyright (C) 2004-2007,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom/c_pzasusb8.c b/custom/c_pzasusb8.c
index bcf168a..9720a28 100644
--- a/custom/c_pzasusb8.c
+++ b/custom/c_pzasusb8.c
@@ -1,7 +1,7 @@
 /*
  * c_pzasusb8 - print numerator as a string of USB8s
  *
- * Copyright (C) 1999-2004  Ernest Bowen
+ * Copyright (C) 1999-2004,2021  Ernest Bowen
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom/c_sysinfo.c b/custom/c_sysinfo.c
index 5789936..a24bcf8 100644
--- a/custom/c_sysinfo.c
+++ b/custom/c_sysinfo.c
@@ -1,7 +1,7 @@
 /*
  * c_sysinfo - names and values of selected #defines
  *
- * Copyright (C) 1999-2007  Landon Curt Noll
+ * Copyright (C) 1999-2007,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom/custtbl.c b/custom/custtbl.c
index 3f1d19e..0a407ce 100644
--- a/custom/custtbl.c
+++ b/custom/custtbl.c
@@ -1,7 +1,7 @@
 /*
  * custtbl - custom interface table
  *
- * Copyright (C) 1999-2007  Landon Curt Noll
+ * Copyright (C) 1999-2007,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom/devnull b/custom/devnull
index fe0a2ca..9522424 100644
--- a/custom/devnull
+++ b/custom/devnull
@@ -26,7 +26,7 @@ LIBRARY
 SEE ALSO
     custom
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom/pzasusb8 b/custom/pzasusb8
index 44faf88..3f50733 100644
--- a/custom/pzasusb8
+++ b/custom/pzasusb8
@@ -49,7 +49,7 @@ LIBRARY
 SEE ALSO
     custom
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom/pzasusb8.cal b/custom/pzasusb8.cal
index 98dd38d..6b4f88e 100644
--- a/custom/pzasusb8.cal
+++ b/custom/pzasusb8.cal
@@ -1,7 +1,7 @@
 /*
  * pzasusb8 - print numerator as a string of USB8s
  *
- * Copyright (C) 1999,2004  Ernest Bowen and Landon Curt Noll
+ * Copyright (C) 1999,2004,2021  Ernest Bowen and Landon Curt Noll
  *
  * Primary author:  Ernest Bowen
  *
diff --git a/custom/register b/custom/register
index f86f8bf..75002c4 100644
--- a/custom/register
+++ b/custom/register
@@ -55,7 +55,7 @@ LIBRARY
 SEE ALSO
     custom
 
-## Copyright (C) 2007  Landon Curt Noll
+## Copyright (C) 2007,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/custom/sysinfo b/custom/sysinfo
index 6006327..b35a8a6 100644
--- a/custom/sysinfo
+++ b/custom/sysinfo
@@ -53,7 +53,7 @@ LIBRARY
 SEE ALSO
     custom
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/endian.c b/endian.c
index 7fb729a..e8c9712 100644
--- a/endian.c
+++ b/endian.c
@@ -1,7 +1,7 @@
 /*
  * endian - determine the byte order of a long on your machine
  *
- * Copyright (C) 1999-2013  Landon Curt Noll
+ * Copyright (C) 1999-2013,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/file.h b/file.h
index e048bce..6583bbe 100644
--- a/file.h
+++ b/file.h
@@ -1,7 +1,7 @@
 /*
  * file - file I/O routines callable by users
  *
- * Copyright (C) 1999-2007,2014  David I. Bell and Landon Curt Noll
+ * Copyright (C) 1999-2007,2014,2021  David I. Bell and Landon Curt Noll
  *
  * Primary author:  David I. Bell
  *
diff --git a/fposval.c b/fposval.c
index c0eebc1..56a686e 100644
--- a/fposval.c
+++ b/fposval.c
@@ -1,7 +1,7 @@
 /*
  * fposval - Determine information about the file position type
  *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/hash.c b/hash.c
index 38e8dbb..5bf3091 100644
--- a/hash.c
+++ b/hash.c
@@ -1,7 +1,7 @@
 /*
  * hash - one-way hash routines
  *
- * Copyright (C) 1999-2007  Landon Curt Noll
+ * Copyright (C) 1999-2007,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/have_const.c b/have_const.c
index 1df3de3..d7100ce 100644
--- a/have_const.c
+++ b/have_const.c
@@ -1,7 +1,7 @@
 /*
  * have_const - Determine if we want or can support ANSI const
  *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/address b/help/address
index be441d2..4a943b2 100644
--- a/help/address
+++ b/help/address
@@ -160,7 +160,7 @@ LINK LIBRARY
 SEE ALSO
     dereference, isptr
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/agd b/help/agd
index 31a077b..f6bae08 100644
--- a/help/agd
+++ b/help/agd
@@ -56,7 +56,7 @@ LINK LIBRARY
 SEE ALSO
     gd, exp, ln, sin, sinh, etc.
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/builtin.end b/help/builtin.end
index 46ea01b..edcd1c8 100644
--- a/help/builtin.end
+++ b/help/builtin.end
@@ -199,7 +199,7 @@
 	For convenience, any non-integer value is assumed to mean "frac",
 	and any integer >= 2^64 is assumed to mean "exp".
 
-## Copyright (C) 1999-2017  Landon Curt Noll
+## Copyright (C) 1999-2017,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/catalan b/help/catalan
index b9ff92a..7ec854f 100644
--- a/help/catalan
+++ b/help/catalan
@@ -37,7 +37,7 @@ LINK LIBRARY
 SEE ALSO
     comb, fact, perm
 
-## Copyright (C) 2000  Ernest Bowen
+## Copyright (C) 2000,2021  Ernest Bowen
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/cfsim b/help/cfsim
index 83672aa..18db78f 100644
--- a/help/cfsim
+++ b/help/cfsim
@@ -113,7 +113,7 @@ LINK LIBRARY
 SEE ALSO
     cfappr
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/cmp b/help/cmp
index 6e82b7e..32ae502 100644
--- a/help/cmp
+++ b/help/cmp
@@ -114,7 +114,7 @@ LINK LIBRARY
 SEE ALSO
     sgn, test, operator
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/command b/help/command
index 3457c53..8d84e9b 100644
--- a/help/command
+++ b/help/command
@@ -375,7 +375,7 @@ Command sequence
 	statement   flow control and declaration statements
 	usage	    how to invoke the calc command and calc -options
 
-## Copyright (C) 1999-2006,2018  Landon Curt Noll
+## Copyright (C) 1999-2006,2018,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/config b/help/config
index 3087c85..380744d 100644
--- a/help/config
+++ b/help/config
@@ -1000,7 +1000,7 @@ LINK LIBRARY
 SEE ALSO
      custom, custom_cal, display, epsilon, fprintf, printf, strprintf, usage
 
-## Copyright (C) 1999-2007,2018  Landon Curt Noll
+## Copyright (C) 1999-2007,2018,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/define b/help/define
index 50a2cc1..794297f 100644
--- a/help/define
+++ b/help/define
@@ -191,7 +191,8 @@ LIBRARY
 SEE ALSO
     param, variable, undefine, show
 
-## Copyright (C) 2000-2006  David I. Bell, Landon Curt Noll and Ernest Bowen
+## Copyright (C) 2000-2006,2021  David I. Bell, Landon Curt Noll
+##				 and Ernest Bowen
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/digits b/help/digits
index cb82da1..e3ef480 100644
--- a/help/digits
+++ b/help/digits
@@ -50,7 +50,7 @@ LINK LIBRARY
 SEE ALSO
     digit, places
 
-## Copyright (C) 1999-2003  Landon Curt Noll
+## Copyright (C) 1999-2003,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/estr b/help/estr
index effdf80..4db9313 100644
--- a/help/estr
+++ b/help/estr
@@ -42,7 +42,7 @@ LINK LIBRARY
 SEE ALSO
     str, strprintf
 
-## Copyright (C) 2006  Ernest Bowen
+## Copyright (C) 2006,2021  Ernest Bowen
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/euler b/help/euler
index d6a6257..1434e47 100644
--- a/help/euler
+++ b/help/euler
@@ -37,7 +37,7 @@ LINK LIBRARY
 SEE ALSO
     bernoulli, bell, catalan, comb, fact, perm
 
-## Copyright (C) 2000  Ernest Bowen
+## Copyright (C) 2000,2021  Ernest Bowen
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/fgetfield b/help/fgetfield
index fcfd5b9..77fcee8 100644
--- a/help/fgetfield
+++ b/help/fgetfield
@@ -50,7 +50,7 @@ LINK LIBRARY
 SEE ALSO
     fgetstr, fputstr, fgets, fputs, fopen, files, fprintf
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/freopen b/help/freopen
index 23ae772..98b6a20 100644
--- a/help/freopen
+++ b/help/freopen
@@ -41,7 +41,7 @@ SEE ALSO
     errno, fclose, feof, ferror, fflush, fgetc, fgetline, fgets, files, fopen,
     fprintf, fputc, fputs, fseek, fsize, ftell, isfile, printf, prompt
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/gd b/help/gd
index 8670c10..b4a4851 100644
--- a/help/gd
+++ b/help/gd
@@ -50,7 +50,7 @@ LINK LIBRARY
 SEE ALSO
     agd, exp, ln, sin, sinh, etc.
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/inputlevel b/help/inputlevel
index 7f1d5c3..2dff864 100644
--- a/help/inputlevel
+++ b/help/inputlevel
@@ -35,7 +35,7 @@ LINK LIBRARY
 SEE ALSO
     read, eval, quit, abort, calclevel
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/isatty b/help/isatty
index 305b365..edf6757 100644
--- a/help/isatty
+++ b/help/isatty
@@ -34,7 +34,7 @@ SEE ALSO
     isobjtype, isodd, isprime, isrand, israndom, isreal, isrel,
     issimple, issq, isstr, istype
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/isptr b/help/isptr
index d28ce0f..1790a1e 100644
--- a/help/isptr
+++ b/help/isptr
@@ -40,7 +40,7 @@ LINK LIBRARY
 SEE ALSO
     isnum, isstr, isblk, isoctet
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/jacobi b/help/jacobi
index 34d1433..44dc846 100644
--- a/help/jacobi
+++ b/help/jacobi
@@ -208,7 +208,7 @@ LINK LIBRARY
 
 SEE ALSO
 
-## Copyright (C) 1999,2017  Landon Curt Noll
+## Copyright (C) 1999,2017,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/max b/help/max
index 73e971a..084051d 100644
--- a/help/max
+++ b/help/max
@@ -70,7 +70,7 @@ LINK LIBRARY
 SEE ALSO
     max, obj
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/memsize b/help/memsize
index 9fba1e8..a01dac0 100644
--- a/help/memsize
+++ b/help/memsize
@@ -90,7 +90,7 @@ LINK LIBRARY
 SEE ALSO
     size, sizeof, fsize, strlen, digits
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/meq b/help/meq
index 3d51bf7..a5cd516 100644
--- a/help/meq
+++ b/help/meq
@@ -32,7 +32,7 @@ LINK LIBRARY
 SEE ALSO
     mne, ismult
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/min b/help/min
index 122a521..8da96c7 100644
--- a/help/min
+++ b/help/min
@@ -70,7 +70,7 @@ LINK LIBRARY
 SEE ALSO
     max, obj, sum, ssq
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/mne b/help/mne
index 3724803..d4d101e 100644
--- a/help/mne
+++ b/help/mne
@@ -28,7 +28,7 @@ LINK LIBRARY
 SEE ALSO
     meq
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/operator b/help/operator
index 39e13f0..f3e8160 100644
--- a/help/operator
+++ b/help/operator
@@ -209,7 +209,7 @@ operators
     surprises in calc syntax/usage.  Persons familiar with C should
     read the 'unexpected' help file to avoid confusion.
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/overview b/help/overview
index e818b94..a89b353 100644
--- a/help/overview
+++ b/help/overview
@@ -186,7 +186,7 @@
     to be calculated.  Global variables which are numbers can be
     saved to a file by using the 'write filename' command.
 
-## Copyright (C) 1999-2017  Landon Curt Noll
+## Copyright (C) 1999-2017,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/pound b/help/pound
index 25c51c3..b9ae52d 100644
--- a/help/pound
+++ b/help/pound
@@ -100,7 +100,7 @@ LINK LIBRARY
 SEE ALSO
     cscript, unexpected, usage
 
-## Copyright (C) 2007,2014  Landon Curt Noll
+## Copyright (C) 2007,2014,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/printf b/help/printf
index a18af39..b34d839 100644
--- a/help/printf
+++ b/help/printf
@@ -231,7 +231,7 @@ LINK LIBRARY
 SEE ALSO
     config, display, epsilon, fprintf, strprintf
 
-## Copyright (C) 1999-2006,2018  Landon Curt Noll
+## Copyright (C) 1999-2006,2018,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/protect b/help/protect
index fb99b12..c85e4a0 100644
--- a/help/protect
+++ b/help/protect
@@ -280,7 +280,7 @@ LINK LIBRARY
 SEE ALSO
     assign, copy, blk, error, errno, strerror
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/ptest b/help/ptest
index c4e91ee..b25daa3 100644
--- a/help/ptest
+++ b/help/ptest
@@ -137,7 +137,7 @@ SEE ALSO
     factor, isprime, lfactor, nextcand, nextprime, prevcand, prevprime,
     pfact, pix
 
-## Copyright (C) 1999-2006,2017  Landon Curt Noll
+## Copyright (C) 1999-2006,2017,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/quomod b/help/quomod
index 95d6489..37bbeaa 100644
--- a/help/quomod
+++ b/help/quomod
@@ -99,7 +99,7 @@ LINK LIBRARY
 SEE ALSO
     //,	 %, quo, mod, floor. ceil, int. frac
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/rand b/help/rand
index 74a3341..ccf884f 100644
--- a/help/rand
+++ b/help/rand
@@ -243,7 +243,7 @@ LINK LIBRARY
 SEE ALSO
     seed, srand, randbit, isrand, random, srandom, israndom
 
-## Copyright (C) 1999-2007  Landon Curt Noll
+## Copyright (C) 1999-2007,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/rsearch b/help/rsearch
index 29db51c..6dd0f5d 100644
--- a/help/rsearch
+++ b/help/rsearch
@@ -109,7 +109,7 @@ SEE ALSO
 
      assoc, list, mat
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/script b/help/script
index 344019c..84cf770 100644
--- a/help/script
+++ b/help/script
@@ -273,7 +273,7 @@ For more information use the following calc commands:
     help config
     help cscript
 
-## Copyright (C) 2000,2014  Landon Curt Noll and Ernest Bowen
+## Copyright (C) 2000,2014,2021  Landon Curt Noll and Ernest Bowen
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/search b/help/search
index 08a1709..77986ee 100644
--- a/help/search
+++ b/help/search
@@ -125,7 +125,7 @@ SEE ALSO
 
      assoc, list, mat
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/sha1 b/help/sha1
index ec52cc3..6c2712f 100644
--- a/help/sha1
+++ b/help/sha1
@@ -99,7 +99,7 @@ LINK LIBRARY
 SEE ALSO
     ishash, hash
 
-## Copyright (C) 1999-20007  Landon Curt Noll
+## Copyright (C) 1999-2007,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/size b/help/size
index 25e82b9..a4c7250 100644
--- a/help/size
+++ b/help/size
@@ -57,7 +57,7 @@ LINK LIBRARY
 SEE ALSO
      list, mat, assoc, obj, sizeof, memsize
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/sizeof b/help/sizeof
index d153929..bb19589 100644
--- a/help/sizeof
+++ b/help/sizeof
@@ -85,7 +85,7 @@ LINK LIBRARY
 SEE ALSO
     size, fsize, strlen, digits
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/sort b/help/sort
index 11a2b08..547fb9f 100644
--- a/help/sort
+++ b/help/sort
@@ -249,7 +249,7 @@ LINK LIBRARY
 SEE ALSO
     join, reverse
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/srandom b/help/srandom
index 2ea9f84..43966a9 100644
--- a/help/srandom
+++ b/help/srandom
@@ -338,7 +338,7 @@ LINK LIBRARY
 SEE ALSO
     seed, srand, randbit, isrand, random, srandom, israndom
 
-## Copyright (C) 1999,2018  Landon Curt Noll
+## Copyright (C) 1999,2018,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/strncpy b/help/strncpy
index 7ed3527..6725cc6 100644
--- a/help/strncpy
+++ b/help/strncpy
@@ -39,7 +39,7 @@ SEE ALSO
     strcat, strcpy, strerror, strlen, strncmp, strpos,
     strprintf, strscan, strscanf, substr
 
-## Copyright (C) 2006  Ernest Bowen
+## Copyright (C) 2006,2021  Ernest Bowen
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/strpos b/help/strpos
index 98486c3..b488507 100644
--- a/help/strpos
+++ b/help/strpos
@@ -39,7 +39,7 @@ SEE ALSO
     strcat, strcpy, strerror, strlen, strncmp, strncpy,
     strprintf, strscan, strscanf, substr
 
-## Copyright (C) 1999-2006  Ernest Bowen
+## Copyright (C) 1999-2006,2021  Ernest Bowen
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/strtolower b/help/strtolower
index 0d631c4..61698ff 100644
--- a/help/strtolower
+++ b/help/strtolower
@@ -30,7 +30,7 @@ SEE ALSO
     strcat, strcpy, strerror, strlen, strncmp, strncpy, strpos,
     strprintf, strscanf, substr
 
-## Copyright (C) 2013 Christoph Zurnieden
+## Copyright (C) 2013,2021 Christoph Zurnieden
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/strtoupper b/help/strtoupper
index 5170fa7..8ae5646 100644
--- a/help/strtoupper
+++ b/help/strtoupper
@@ -30,7 +30,7 @@ SEE ALSO
     strcat, strcpy, strerror, strlen, strncmp, strncpy, strpos,
     strprintf, strscanf, substr, strtoupper
 
-## Copyright (C) 2013 Christoph Zurnieden
+## Copyright (C) 2013,2021 Christoph Zurnieden
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/sum b/help/sum
index 6145c26..174033c 100644
--- a/help/sum
+++ b/help/sum
@@ -58,7 +58,7 @@ LINK LIBRARY
 SEE ALSO
     max, min, obj, ssq
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/system b/help/system
index 5598ec9..f81e1ea 100644
--- a/help/system
+++ b/help/system
@@ -43,7 +43,7 @@ LINK LIBRARY
 SEE ALSO
     cmdbuf, argv
 
-## Copyright (C) 1999-2006  Landon Curt Noll
+## Copyright (C) 1999-2006,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/time b/help/time
index 164fd86..8ff5e41 100644
--- a/help/time
+++ b/help/time
@@ -26,7 +26,7 @@ LINK LIBRARY
 SEE ALSO
     ctime, runtime
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/trunc b/help/trunc
index 6418b76..4db40a3 100644
--- a/help/trunc
+++ b/help/trunc
@@ -35,7 +35,7 @@ LINK LIBRARY
 SEE ALSO
     bround, btrunc, int, round
 
-## Copyright (C) 1999  Landon Curt Noll
+## Copyright (C) 1999,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/unexpected b/help/unexpected
index 7c955e3..24e3ce0 100644
--- a/help/unexpected
+++ b/help/unexpected
@@ -404,7 +404,7 @@ Unexpected
 	64
 
 
-## Copyright (C) 1999-2007,2014,2017  Landon Curt Noll
+## Copyright (C) 1999-2007,2014,2017,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/help/version b/help/version
index ca0307a..bcb5948 100644
--- a/help/version
+++ b/help/version
@@ -32,7 +32,7 @@ LINK LIBRARY
 SEE ALSO
     n/a
 
-## Copyright (C) 2001  Landon Curt Noll
+## Copyright (C) 2001,2021  Landon Curt Noll
 ##
 ## Calc is open software; you can redistribute it and/or modify it under
 ## the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/hist.h b/hist.h
index 18d603f..411bb39 100644
--- a/hist.h
+++ b/hist.h
@@ -1,7 +1,7 @@
 /*
  * hist - definitions for command history module
  *
- * Copyright (C) 1999-2007,2014  David I. Bell
+ * Copyright (C) 1999-2007,2014,2021  David I. Bell
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/lib_util.c b/lib_util.c
index c2127e6..0271ed9 100644
--- a/lib_util.c
+++ b/lib_util.c
@@ -1,7 +1,7 @@
 /*
  * lib_util - calc library utility routines
  *
- * Copyright (C) 1999-2006  Landon Curt Noll
+ * Copyright (C) 1999-2006,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/matfunc.c b/matfunc.c
index a18d0fa..e31182d 100644
--- a/matfunc.c
+++ b/matfunc.c
@@ -1,7 +1,7 @@
 /*
  * matfunc - extended precision rational arithmetic matrix functions
  *
- * Copyright (C) 1999-2007  David I. Bell
+ * Copyright (C) 1999-2007,2021  David I. Bell
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/math_error.c b/math_error.c
index b67d3c3..3029502 100644
--- a/math_error.c
+++ b/math_error.c
@@ -1,7 +1,7 @@
 /*
  * math_error - a simple libcalc math error routine
  *
- * Copyright (C) 1999  Landon Curt Noll
+ * Copyright (C) 1999,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/opcodes.h b/opcodes.h
index 681d1de..fc077ad 100644
--- a/opcodes.h
+++ b/opcodes.h
@@ -1,7 +1,7 @@
 /*
  * opcodes - opcode execution module definition
  *
- * Copyright (C) 1999-2007,2014  David I. Bell
+ * Copyright (C) 1999-2007,2014,2021  David I. Bell
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/prime.h b/prime.h
index 5f827c4..9eaead6 100644
--- a/prime.h
+++ b/prime.h
@@ -1,7 +1,7 @@
 /*
  * prime - quickly determine if a small number is prime
  *
- * Copyright (C) 1999-2007,2014  Landon Curt Noll
+ * Copyright (C) 1999-2007,2014,2021  Landon Curt Noll
  *
  * Calc is open software; you can redistribute it and/or modify it under
  * the terms of the version 2.1 of the GNU Lesser General Public License
diff --git a/qfunc.c b/qfunc.c
index 6bd6e4e..07ae1f4 100644
--- a/qfunc.c
+++ b/qfunc.c
@@ -1,7 +1,7 @@
 /*
  * qfunc - extended precision rational arithmetic non-primitive functions
  *
- * Copyright (C) 1999-2007  David I. Bell and Ernest Bowen
+ * Copyright (C) 1999-2007,2021  David I. Bell and Ernest Bowen
  *
  * Primary author:  David I. Bell
  *
diff --git a/qmath.c b/qmath.c
index 3829abf..9e8738a 100644
--- a/qmath.c
+++ b/qmath.c
@@ -1,7 +1,7 @@
 /*
  * qmath - extended precision rational arithmetic primitive routines
  *
- * Copyright (C) 1999-2007,2014  David I. Bell and Ernest Bowen
+ * Copyright (C) 1999-2007,2014,2021  David I. Bell and Ernest Bowen
  *
  * Primary author:  David I. Bell
  *
diff --git a/qtrans.c b/qtrans.c
index 7ba2f2f..9f500c7 100644
--- a/qtrans.c
+++ b/qtrans.c
@@ -1,7 +1,7 @@
 /*
  * qtrans - transcendental functions for real numbers
  *
- * Copyright (C) 1999-2007  David I. Bell and Ernest Bowen
+ * Copyright (C) 1999-2007,2021  David I. Bell and Ernest Bowen
  *
  * Primary author:  David I. Bell
  *