diff --git a/lib/bt_matchfinder.h b/lib/bt_matchfinder.h
index a994a57..c6231a2 100644
--- a/lib/bt_matchfinder.h
+++ b/lib/bt_matchfinder.h
@@ -1,8 +1,6 @@
 /*
  * bt_matchfinder.h - Lempel-Ziv matchfinding with a hash table of binary trees
  *
- * Originally public domain; changes after 2016-09-07 are copyrighted.
- *
  * Copyright 2016 Eric Biggers
  *
  * Permission is hereby granted, free of charge, to any person
diff --git a/lib/deflate_compress.c b/lib/deflate_compress.c
index cf43798..5baf85b 100644
--- a/lib/deflate_compress.c
+++ b/lib/deflate_compress.c
@@ -1,8 +1,6 @@
 /*
  * deflate_compress.c - a compressor for DEFLATE
  *
- * Originally public domain; changes after 2016-09-07 are copyrighted.
- *
  * Copyright 2016 Eric Biggers
  *
  * Permission is hereby granted, free of charge, to any person
diff --git a/lib/gzip_compress.c b/lib/gzip_compress.c
index 3cb8803..755fe5f 100644
--- a/lib/gzip_compress.c
+++ b/lib/gzip_compress.c
@@ -1,8 +1,6 @@
 /*
  * gzip_compress.c - compress with a gzip wrapper
  *
- * Originally public domain; changes after 2016-09-07 are copyrighted.
- *
  * Copyright 2016 Eric Biggers
  *
  * Permission is hereby granted, free of charge, to any person
diff --git a/lib/gzip_decompress.c b/lib/gzip_decompress.c
index 1b31d8a..2a96a4e 100644
--- a/lib/gzip_decompress.c
+++ b/lib/gzip_decompress.c
@@ -1,8 +1,6 @@
 /*
  * gzip_decompress.c - decompress with a gzip wrapper
  *
- * Originally public domain; changes after 2016-09-07 are copyrighted.
- *
  * Copyright 2016 Eric Biggers
  *
  * Permission is hereby granted, free of charge, to any person
diff --git a/lib/hc_matchfinder.h b/lib/hc_matchfinder.h
index b81d32c..c66053e 100644
--- a/lib/hc_matchfinder.h
+++ b/lib/hc_matchfinder.h
@@ -1,8 +1,6 @@
 /*
  * hc_matchfinder.h - Lempel-Ziv matchfinding with a hash table of linked lists
  *
- * Originally public domain; changes after 2016-09-07 are copyrighted.
- *
  * Copyright 2016 Eric Biggers
  *
  * Permission is hereby granted, free of charge, to any person
diff --git a/lib/zlib_compress.c b/lib/zlib_compress.c
index ab00751..f066d52 100644
--- a/lib/zlib_compress.c
+++ b/lib/zlib_compress.c
@@ -1,8 +1,6 @@
 /*
  * zlib_compress.c - compress with a zlib wrapper
  *
- * Originally public domain; changes after 2016-09-07 are copyrighted.
- *
  * Copyright 2016 Eric Biggers
  *
  * Permission is hereby granted, free of charge, to any person
diff --git a/lib/zlib_decompress.c b/lib/zlib_decompress.c
index 0f6c714..11fc7a8 100644
--- a/lib/zlib_decompress.c
+++ b/lib/zlib_decompress.c
@@ -1,8 +1,6 @@
 /*
  * zlib_decompress.c - decompress with a zlib wrapper
  *
- * Originally public domain; changes after 2016-09-07 are copyrighted.
- *
  * Copyright 2016 Eric Biggers
  *
  * Permission is hereby granted, free of charge, to any person
diff --git a/scripts/gen_crc32_table.c b/scripts/gen_crc32_table.c
index ab39376..3722bec 100644
--- a/scripts/gen_crc32_table.c
+++ b/scripts/gen_crc32_table.c
@@ -1,8 +1,6 @@
 /*
  * gen_crc32_table.c - a program for CRC-32 table generation
  *
- * Originally public domain; changes after 2016-09-07 are copyrighted.
- *
  * Copyright 2016 Eric Biggers
  *
  * Permission is hereby granted, free of charge, to any person