diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 00000000..4d079de3
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,21 @@
+# This is the list of RGBDS's significant contributors.
+#
+# This does not necessarily list everyone who has contributed code.
+# To see the full list of contributors, see the revision history in
+# source control.
+
+Anthony J. Bentley
+Antonio Niño Díaz
+Antonio Vivace
+Ben Hetherington (Ben10do)
+Carsten Sørensen
+David Brotz
+Eldred Habert (ISSOtm)
+Jakub Kądziołka
+James Larrowe (JL2210)
+Justin Lloyd (Otaku no Zoku)
+Sanqui
+stag019
+Sylvie Oukaour (Rangi42)
+Vegard Nossum
+yenatch (padz)
diff --git a/LICENSE b/LICENSE
index e856e8bf..6123080f 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 The MIT License
 
-Copyright (c) 1997-2020, Carsten Sorensen and RGBDS contributors.
+Copyright (c) 1997-2023, Carsten Sørensen and RGBDS contributors.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to
diff --git a/include/asm/charmap.h b/include/asm/charmap.h
index 91d6268c..0e60e77a 100644
--- a/include/asm/charmap.h
+++ b/include/asm/charmap.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_ASM_CHARMAP_H
 #define RGBDS_ASM_CHARMAP_H
diff --git a/include/asm/fixpoint.h b/include/asm/fixpoint.h
index b6374163..23127945 100644
--- a/include/asm/fixpoint.h
+++ b/include/asm/fixpoint.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2021, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_ASM_FIXPOINT_H
 #define RGBDS_ASM_FIXPOINT_H
diff --git a/include/asm/format.h b/include/asm/format.h
index eabdedb5..c7a3b49b 100644
--- a/include/asm/format.h
+++ b/include/asm/format.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2020, RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_FORMAT_SPEC_H
 #define RGBDS_FORMAT_SPEC_H
diff --git a/include/asm/fstack.h b/include/asm/fstack.h
index 5f1851a7..c7d3c160 100644
--- a/include/asm/fstack.h
+++ b/include/asm/fstack.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Contains some assembler-wide defines and externs
 
diff --git a/include/asm/lexer.h b/include/asm/lexer.h
index 91bb0a8e..c09233f9 100644
--- a/include/asm/lexer.h
+++ b/include/asm/lexer.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_ASM_LEXER_H
 #define RGBDS_ASM_LEXER_H
diff --git a/include/asm/macro.h b/include/asm/macro.h
index e0988ee9..efd59130 100644
--- a/include/asm/macro.h
+++ b/include/asm/macro.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2020, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_MACRO_H
 #define RGBDS_MACRO_H
diff --git a/include/asm/main.h b/include/asm/main.h
index de991922..f75c008a 100644
--- a/include/asm/main.h
+++ b/include/asm/main.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2021, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_MAIN_H
 #define RGBDS_MAIN_H
diff --git a/include/asm/opt.h b/include/asm/opt.h
index f9e9345b..0d9fd3f0 100644
--- a/include/asm/opt.h
+++ b/include/asm/opt.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2021, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_OPT_H
 #define RGBDS_OPT_H
diff --git a/include/asm/output.h b/include/asm/output.h
index 579e9a45..f2ffc186 100644
--- a/include/asm/output.h
+++ b/include/asm/output.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_ASM_OUTPUT_H
 #define RGBDS_ASM_OUTPUT_H
diff --git a/include/asm/rpn.h b/include/asm/rpn.h
index 8711ef31..488cb003 100644
--- a/include/asm/rpn.h
+++ b/include/asm/rpn.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_ASM_RPN_H
 #define RGBDS_ASM_RPN_H
diff --git a/include/asm/section.h b/include/asm/section.h
index c2fc531f..6427be78 100644
--- a/include/asm/section.h
+++ b/include/asm/section.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2020, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_SECTION_H
 #define RGBDS_SECTION_H
diff --git a/include/asm/symbol.h b/include/asm/symbol.h
index 627868f4..55a3f64d 100644
--- a/include/asm/symbol.h
+++ b/include/asm/symbol.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2020, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_SYMBOL_H
 #define RGBDS_SYMBOL_H
diff --git a/include/asm/util.h b/include/asm/util.h
index d844cc95..f8d73eaf 100644
--- a/include/asm/util.h
+++ b/include/asm/util.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_UTIL_H
 #define RGBDS_UTIL_H
diff --git a/include/asm/warning.h b/include/asm/warning.h
index 12b17a5c..44d85729 100644
--- a/include/asm/warning.h
+++ b/include/asm/warning.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef WARNING_H
 #define WARNING_H
diff --git a/include/error.h b/include/error.h
index f7ad06a4..ccfaf94b 100644
--- a/include/error.h
+++ b/include/error.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2021, RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_ERROR_H
 #define RGBDS_ERROR_H
diff --git a/include/extern/utf8decoder.h b/include/extern/utf8decoder.h
index 36e83a13..25ce95ad 100644
--- a/include/extern/utf8decoder.h
+++ b/include/extern/utf8decoder.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2018, Antonio Nino Diaz and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef EXTERN_UTF8DECODER_H
 #define EXTERN_UTF8DECODER_H
diff --git a/include/file.hpp b/include/file.hpp
index 38ca3763..1ba365e4 100644
--- a/include/file.hpp
+++ b/include/file.hpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_FILE_HPP
 #define RGBDS_FILE_HPP
diff --git a/include/gfx/main.hpp b/include/gfx/main.hpp
index 7a5b0213..553ed6bf 100644
--- a/include/gfx/main.hpp
+++ b/include/gfx/main.hpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_GFX_MAIN_HPP
 #define RGBDS_GFX_MAIN_HPP
diff --git a/include/gfx/pal_packing.hpp b/include/gfx/pal_packing.hpp
index a3901a72..8f6f4184 100644
--- a/include/gfx/pal_packing.hpp
+++ b/include/gfx/pal_packing.hpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_GFX_PAL_PACKING_HPP
 #define RGBDS_GFX_PAL_PACKING_HPP
diff --git a/include/gfx/pal_sorting.hpp b/include/gfx/pal_sorting.hpp
index 0393607f..aec236a1 100644
--- a/include/gfx/pal_sorting.hpp
+++ b/include/gfx/pal_sorting.hpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_GFX_PAL_SORTING_HPP
 #define RGBDS_GFX_PAL_SORTING_HPP
diff --git a/include/gfx/pal_spec.hpp b/include/gfx/pal_spec.hpp
index 55b815a4..b5f96953 100644
--- a/include/gfx/pal_spec.hpp
+++ b/include/gfx/pal_spec.hpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_GFX_PAL_SPEC_HPP
 #define RGBDS_GFX_PAL_SPEC_HPP
diff --git a/include/gfx/process.hpp b/include/gfx/process.hpp
index 4db5403c..46a1551a 100644
--- a/include/gfx/process.hpp
+++ b/include/gfx/process.hpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_GFX_CONVERT_HPP
 #define RGBDS_GFX_CONVERT_HPP
diff --git a/include/gfx/proto_palette.hpp b/include/gfx/proto_palette.hpp
index f634c12b..a03d4ec9 100644
--- a/include/gfx/proto_palette.hpp
+++ b/include/gfx/proto_palette.hpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_GFX_PROTO_PALETTE_HPP
 #define RGBDS_GFX_PROTO_PALETTE_HPP
diff --git a/include/gfx/reverse.hpp b/include/gfx/reverse.hpp
index 52e5ec3f..bc1fea5a 100644
--- a/include/gfx/reverse.hpp
+++ b/include/gfx/reverse.hpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_GFX_REVERSE_HPP
 #define RGBDS_GFX_REVERSE_HPP
diff --git a/include/gfx/rgba.hpp b/include/gfx/rgba.hpp
index c04e8205..ae41d163 100644
--- a/include/gfx/rgba.hpp
+++ b/include/gfx/rgba.hpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_GFX_RGBA_HPP
 #define RGBDS_GFX_RGBA_HPP
diff --git a/include/hashmap.h b/include/hashmap.h
index 252b732d..afcba1ca 100644
--- a/include/hashmap.h
+++ b/include/hashmap.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Generic hashmap implementation (C++ templates are calling...)
 #ifndef RGBDS_LINK_HASHMAP_H
diff --git a/include/helpers.h b/include/helpers.h
index 63002cf3..e01f2bb6 100644
--- a/include/helpers.h
+++ b/include/helpers.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2014-2020, RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef HELPERS_H
 #define HELPERS_H
diff --git a/include/itertools.hpp b/include/itertools.hpp
index 9c3712fc..d8341f18 100644
--- a/include/itertools.hpp
+++ b/include/itertools.hpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_ITERTOOLS_HPP
 #define RGBDS_ITERTOOLS_HPP
diff --git a/include/link/assign.h b/include/link/assign.h
index e7d0ee0a..1446b3d6 100644
--- a/include/link/assign.h
+++ b/include/link/assign.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Assigning all sections a place
 #ifndef RGBDS_LINK_ASSIGN_H
diff --git a/include/link/main.h b/include/link/main.h
index c7ca7dce..137af11a 100644
--- a/include/link/main.h
+++ b/include/link/main.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Declarations that all modules use, as well as `main` and related
 #ifndef RGBDS_LINK_MAIN_H
diff --git a/include/link/object.h b/include/link/object.h
index 6662fef2..6fe40b4b 100644
--- a/include/link/object.h
+++ b/include/link/object.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Declarations related to processing of object (.o) files
 
diff --git a/include/link/output.h b/include/link/output.h
index d68f254c..da0c66b0 100644
--- a/include/link/output.h
+++ b/include/link/output.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Outputting the result of linking
 #ifndef RGBDS_LINK_OUTPUT_H
diff --git a/include/link/patch.h b/include/link/patch.h
index 37c1f8f9..04867a1c 100644
--- a/include/link/patch.h
+++ b/include/link/patch.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Applying patches to SECTIONs
 #ifndef RGBDS_LINK_PATCH_H
diff --git a/include/link/script.h b/include/link/script.h
index a736bcb0..3f4d6cdd 100644
--- a/include/link/script.h
+++ b/include/link/script.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Parsing a linker script
 #ifndef RGBDS_LINK_SCRIPT_H
diff --git a/include/link/sdas_obj.h b/include/link/sdas_obj.h
index a7e3bbaa..cd096bf5 100644
--- a/include/link/sdas_obj.h
+++ b/include/link/sdas_obj.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Assigning all sections a place
 #ifndef RGBDS_LINK_SDAS_OBJ_H
diff --git a/include/link/section.h b/include/link/section.h
index 8f34417a..a15ad481 100644
--- a/include/link/section.h
+++ b/include/link/section.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Declarations manipulating symbols
 #ifndef RGBDS_LINK_SECTION_H
diff --git a/include/link/symbol.h b/include/link/symbol.h
index 2a161130..f47a8d36 100644
--- a/include/link/symbol.h
+++ b/include/link/symbol.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Declarations manipulating symbols
 #ifndef RGBDS_LINK_SYMBOL_H
diff --git a/include/linkdefs.h b/include/linkdefs.h
index c08fe254..b33a348f 100644
--- a/include/linkdefs.h
+++ b/include/linkdefs.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_LINKDEFS_H
 #define RGBDS_LINKDEFS_H
diff --git a/include/opmath.h b/include/opmath.h
index 4a4b1a04..b178f65d 100644
--- a/include/opmath.h
+++ b/include/opmath.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2021, RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef RGBDS_OP_MATH_H
 #define RGBDS_OP_MATH_H
diff --git a/include/platform.h b/include/platform.h
index 3362fa4e..2641cedd 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2020 RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // platform-specific hacks
 
diff --git a/include/version.h b/include/version.h
index 6a06c1af..eff789cb 100644
--- a/include/version.h
+++ b/include/version.h
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2017-2021, Antonio Nino Diaz and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #ifndef EXTERN_VERSION_H
 #define EXTERN_VERSION_H
diff --git a/man/gbz80.7 b/man/gbz80.7
index ce628c30..23b8dc33 100644
--- a/man/gbz80.7
+++ b/man/gbz80.7
@@ -1,8 +1,3 @@
-.\"
-.\" This file is part of RGBDS.
-.\"
-.\" Copyright (c) 2017-2021, Antonio Nino Diaz and RGBDS contributors.
-.\"
 .\" SPDX-License-Identifier: MIT
 .\"
 .Dd March 28, 2021
diff --git a/man/rgbasm.1 b/man/rgbasm.1
index ea7ddc8f..dbbe7d41 100644
--- a/man/rgbasm.1
+++ b/man/rgbasm.1
@@ -1,8 +1,3 @@
-.\"
-.\" This file is part of RGBDS.
-.\"
-.\" Copyright (c) 2010-2021, Anthony J. Bentley and RGBDS contributors.
-.\"
 .\" SPDX-License-Identifier: MIT
 .\"
 .Dd March 28, 2021
diff --git a/man/rgbasm.5 b/man/rgbasm.5
index 68548c7a..d75a92fa 100644
--- a/man/rgbasm.5
+++ b/man/rgbasm.5
@@ -1,9 +1,3 @@
-'\" e
-.\"
-.\" This file is part of RGBDS.
-.\"
-.\" Copyright (c) 2017-2021, Antonio Nino Diaz and RGBDS contributors.
-.\"
 .\" SPDX-License-Identifier: MIT
 .\"
 .Dd March 28, 2021
diff --git a/man/rgbds.5 b/man/rgbds.5
index 466a8fb4..df586348 100644
--- a/man/rgbds.5
+++ b/man/rgbds.5
@@ -1,8 +1,3 @@
-.\"
-.\" This file is part of RGBDS.
-.\"
-.\" Copyright (c) 2017-2021, Antonio Nino Diaz and RGBDS contributors.
-.\"
 .\" SPDX-License-Identifier: MIT
 .\"
 .Dd March 28, 2021
diff --git a/man/rgbds.7 b/man/rgbds.7
index 8e07a636..eff8c748 100644
--- a/man/rgbds.7
+++ b/man/rgbds.7
@@ -1,8 +1,3 @@
-.\"
-.\" This file is part of RGBDS.
-.\"
-.\" Copyright (c) 2010-2021, Anthony J. Bentley and RGBDS contributors.
-.\"
 .\" SPDX-License-Identifier: MIT
 .\"
 .Dd March 28, 2021
diff --git a/man/rgbfix.1 b/man/rgbfix.1
index 416c3b32..f8dfb277 100644
--- a/man/rgbfix.1
+++ b/man/rgbfix.1
@@ -1,8 +1,3 @@
-.\"
-.\" This file is part of RGBDS.
-.\"
-.\" Copyright (c) 2010-2021, Anthony J. Bentley and RGBDS contributors.
-.\"
 .\" SPDX-License-Identifier: MIT
 .\"
 .Dd March 28, 2021
diff --git a/man/rgbgfx.1 b/man/rgbgfx.1
index c3cda690..eaf4d6a1 100644
--- a/man/rgbgfx.1
+++ b/man/rgbgfx.1
@@ -1,9 +1,3 @@
-'\" e
-.\"
-.\" This file is part of RGBDS.
-.\"
-.\" Copyright (c) 2013-2021, stag019 and RGBDS contributors.
-.\"
 .\" SPDX-License-Identifier: MIT
 .\"
 .Dd March 28, 2021
diff --git a/man/rgblink.1 b/man/rgblink.1
index 0537a9eb..2c86cc66 100644
--- a/man/rgblink.1
+++ b/man/rgblink.1
@@ -1,8 +1,3 @@
-.\"
-.\" This file is part of RGBDS.
-.\"
-.\" Copyright (c) 2010-2021, Anthony J. Bentley and RGBDS contributors.
-.\"
 .\" SPDX-License-Identifier: MIT
 .\"
 .Dd March 28, 2021
diff --git a/man/rgblink.5 b/man/rgblink.5
index ea827709..57e43eb0 100644
--- a/man/rgblink.5
+++ b/man/rgblink.5
@@ -1,8 +1,3 @@
-.\"
-.\" This file is part of RGBDS.
-.\"
-.\" Copyright (c) 2017-2021, Antonio Nino Diaz and RGBDS contributors.
-.\"
 .\" SPDX-License-Identifier: MIT
 .\"
 .Dd March 28, 2021
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 78d1472b..8098ef10 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,10 +1,4 @@
-#
-# This file is part of RGBDS.
-#
-# Copyright (c) 2020 RGBDS contributors.
-#
 # SPDX-License-Identifier: MIT
-#
 
 configure_file(version.c _version.c ESCAPE_QUOTES)
 
diff --git a/src/asm/charmap.c b/src/asm/charmap.c
index 8a989fa3..798d25fe 100644
--- a/src/asm/charmap.c
+++ b/src/asm/charmap.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2013-2018, stag019 and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <errno.h>
 #include <stdbool.h>
diff --git a/src/asm/fixpoint.c b/src/asm/fixpoint.c
index 861fd1ce..aabe18dc 100644
--- a/src/asm/fixpoint.c
+++ b/src/asm/fixpoint.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2021, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Fixed-point math routines
 
diff --git a/src/asm/format.c b/src/asm/format.c
index 960775d6..760413f1 100644
--- a/src/asm/format.c
+++ b/src/asm/format.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2020, RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <assert.h>
 #include <inttypes.h>
diff --git a/src/asm/fstack.c b/src/asm/fstack.c
index d5147fda..78678e68 100644
--- a/src/asm/fstack.c
+++ b/src/asm/fstack.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <sys/stat.h>
 #include <assert.h>
diff --git a/src/asm/lexer.c b/src/asm/lexer.c
index 8a16f515..e80cd90d 100644
--- a/src/asm/lexer.c
+++ b/src/asm/lexer.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2020, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/src/asm/macro.c b/src/asm/macro.c
index 655d3d03..e69d5163 100644
--- a/src/asm/macro.c
+++ b/src/asm/macro.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <errno.h>
 #include <inttypes.h>
diff --git a/src/asm/main.c b/src/asm/main.c
index 68dd21b7..9e2d2a7a 100644
--- a/src/asm/main.c
+++ b/src/asm/main.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <ctype.h>
 #include <errno.h>
diff --git a/src/asm/opt.c b/src/asm/opt.c
index 697041b6..7dafa0eb 100644
--- a/src/asm/opt.c
+++ b/src/asm/opt.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <ctype.h>
 #include <errno.h>
diff --git a/src/asm/output.c b/src/asm/output.c
index 4ca96bb7..a38bda90 100644
--- a/src/asm/output.c
+++ b/src/asm/output.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Outputs an objectfile
 
diff --git a/src/asm/parser.y b/src/asm/parser.y
index 846a4d39..daef5a3d 100644
--- a/src/asm/parser.y
+++ b/src/asm/parser.y
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 %{
 #include <ctype.h>
diff --git a/src/asm/rpn.c b/src/asm/rpn.c
index 6424e0e6..17fb7b1d 100644
--- a/src/asm/rpn.c
+++ b/src/asm/rpn.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Controls RPN expressions for objectfiles
 
diff --git a/src/asm/section.c b/src/asm/section.c
index fd700744..c30a7896 100644
--- a/src/asm/section.c
+++ b/src/asm/section.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <assert.h>
 #include <errno.h>
diff --git a/src/asm/symbol.c b/src/asm/symbol.c
index 15621c90..c4f8f9bf 100644
--- a/src/asm/symbol.c
+++ b/src/asm/symbol.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Symboltable and macroargs stuff
 
diff --git a/src/asm/util.c b/src/asm/util.c
index 8a4f57ae..9d1d0379 100644
--- a/src/asm/util.c
+++ b/src/asm/util.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <ctype.h>
 #include <stdint.h>
diff --git a/src/asm/warning.c b/src/asm/warning.c
index e501da23..aca344a5 100644
--- a/src/asm/warning.c
+++ b/src/asm/warning.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <inttypes.h>
 #include <limits.h>
diff --git a/src/check_bison_ver.sh b/src/check_bison_ver.sh
index c186a378..2c7134df 100755
--- a/src/check_bison_ver.sh
+++ b/src/check_bison_ver.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+
 bison -V | awk -v major="$1" -v minor="$2" '
 /^bison.*[0-9]+(\.[0-9]+)(\.[0-9]+)?$/ {
 	match($0, /[0-9]+(\.[0-9]+)(\.[0-9]+)?$/);
diff --git a/src/error.c b/src/error.c
index aec68e65..c27be9c1 100644
--- a/src/error.c
+++ b/src/error.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2005-2021, Rich Felker and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <errno.h>
 #include <stdarg.h>
diff --git a/src/extern/getopt.c b/src/extern/getopt.c
index 652893f2..737e93c0 100644
--- a/src/extern/getopt.c
+++ b/src/extern/getopt.c
@@ -1,24 +1,7 @@
 /*
- * Copyright © 2005-2020 Rich Felker, et al.
+ * Copyright (c) 2005-2020 Rich Felker, et al.
  *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
- * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
- * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * SPDX-License-Identifier: MIT
  */
 
 /* This implementation was taken from musl and modified for RGBDS */
diff --git a/src/fix/main.c b/src/fix/main.c
index d603452d..64fd610c 100644
--- a/src/fix/main.c
+++ b/src/fix/main.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2020, Eldred habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/src/gfx/main.cpp b/src/gfx/main.cpp
index 2e2aaf79..ddf2a00f 100644
--- a/src/gfx/main.cpp
+++ b/src/gfx/main.cpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include "gfx/main.hpp"
 
diff --git a/src/gfx/pal_packing.cpp b/src/gfx/pal_packing.cpp
index 72d6ffe8..8c876f2b 100644
--- a/src/gfx/pal_packing.cpp
+++ b/src/gfx/pal_packing.cpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include "gfx/pal_packing.hpp"
 
diff --git a/src/gfx/pal_sorting.cpp b/src/gfx/pal_sorting.cpp
index 924f359d..aee5cbf2 100644
--- a/src/gfx/pal_sorting.cpp
+++ b/src/gfx/pal_sorting.cpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include "gfx/pal_sorting.hpp"
 
diff --git a/src/gfx/pal_spec.cpp b/src/gfx/pal_spec.cpp
index 613eada6..5349dc5e 100644
--- a/src/gfx/pal_spec.cpp
+++ b/src/gfx/pal_spec.cpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include "gfx/pal_spec.hpp"
 
diff --git a/src/gfx/process.cpp b/src/gfx/process.cpp
index 0e1721f7..0181f9fe 100644
--- a/src/gfx/process.cpp
+++ b/src/gfx/process.cpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include "gfx/process.hpp"
 
diff --git a/src/gfx/proto_palette.cpp b/src/gfx/proto_palette.cpp
index d67db291..5069ad8b 100644
--- a/src/gfx/proto_palette.cpp
+++ b/src/gfx/proto_palette.cpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include "gfx/proto_palette.hpp"
 
diff --git a/src/gfx/reverse.cpp b/src/gfx/reverse.cpp
index b85c6f1e..bede1b60 100644
--- a/src/gfx/reverse.cpp
+++ b/src/gfx/reverse.cpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include "gfx/reverse.hpp"
 
diff --git a/src/gfx/rgba.cpp b/src/gfx/rgba.cpp
index c3486bac..96493a37 100644
--- a/src/gfx/rgba.cpp
+++ b/src/gfx/rgba.cpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include "gfx/rgba.hpp"
 
diff --git a/src/hashmap.c b/src/hashmap.c
index 55b8592f..108a0c82 100644
--- a/src/hashmap.c
+++ b/src/hashmap.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <stdint.h>
 #include <stdbool.h>
diff --git a/src/link/assign.c b/src/link/assign.c
index 930803e3..e03bc900 100644
--- a/src/link/assign.c
+++ b/src/link/assign.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <inttypes.h>
 #include <stdbool.h>
diff --git a/src/link/main.c b/src/link/main.c
index 74b0393c..22c18392 100644
--- a/src/link/main.c
+++ b/src/link/main.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <assert.h>
 #include <inttypes.h>
diff --git a/src/link/object.c b/src/link/object.c
index f4d0cebe..a7b567e0 100644
--- a/src/link/object.c
+++ b/src/link/object.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <errno.h>
 #include <inttypes.h>
diff --git a/src/link/output.c b/src/link/output.c
index db15cd7d..71f33bf9 100644
--- a/src/link/output.c
+++ b/src/link/output.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <assert.h>
 #include <inttypes.h>
diff --git a/src/link/patch.c b/src/link/patch.c
index 9ac86bd0..d6995a65 100644
--- a/src/link/patch.c
+++ b/src/link/patch.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <assert.h>
 #include <inttypes.h>
diff --git a/src/link/script.c b/src/link/script.c
index 7d3705c4..b2f83570 100644
--- a/src/link/script.c
+++ b/src/link/script.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <ctype.h>
 #include <inttypes.h>
diff --git a/src/link/sdas_obj.c b/src/link/sdas_obj.c
index 075650d4..caad0365 100644
--- a/src/link/sdas_obj.c
+++ b/src/link/sdas_obj.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <assert.h>
 #include <ctype.h>
diff --git a/src/link/section.c b/src/link/section.c
index 7ea5a30f..5ef2813e 100644
--- a/src/link/section.c
+++ b/src/link/section.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <assert.h>
 #include <inttypes.h>
diff --git a/src/link/symbol.c b/src/link/symbol.c
index c270c8fc..9b7089b1 100644
--- a/src/link/symbol.c
+++ b/src/link/symbol.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2019, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <inttypes.h>
 #include <stdbool.h>
diff --git a/src/linkdefs.c b/src/linkdefs.c
index 337603ee..e8368051 100644
--- a/src/linkdefs.c
+++ b/src/linkdefs.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include "linkdefs.h"
 
diff --git a/src/opmath.c b/src/opmath.c
index f5832ddb..ce70f2b2 100644
--- a/src/opmath.c
+++ b/src/opmath.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 1997-2021, RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // Mathematical operators that don't reuse C's behavior
 
diff --git a/src/version.c b/src/version.c
index d9d4401d..479ae072 100644
--- a/src/version.c
+++ b/src/version.c
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2017-2018, Antonio Nino Diaz and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 #include <stdio.h>
 #include <string.h>
diff --git a/test/gfx/randtilegen.c b/test/gfx/randtilegen.c
index bc83f995..084e5990 100644
--- a/test/gfx/randtilegen.c
+++ b/test/gfx/randtilegen.c
@@ -1,13 +1,10 @@
+/* SPDX-License-Identifier: MIT */
+
 /*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- *
  * Originally:
  * // This program is hereby released to the public domain.
  * // ~aaaaaa123456789, released 2022-03-15
+ *
  * https://gist.github.com/aaaaaa123456789/3feccf085ab4f82d144d9a47fb1b4bdf
  *
  * This was modified to use libpng instead of libplum, as well as comments and style changes.
diff --git a/test/gfx/rgbgfx_test.cpp b/test/gfx/rgbgfx_test.cpp
index 6bbfa7b4..c1c1bc59 100644
--- a/test/gfx/rgbgfx_test.cpp
+++ b/test/gfx/rgbgfx_test.cpp
@@ -1,10 +1,4 @@
-/*
- * This file is part of RGBDS.
- *
- * Copyright (c) 2022, Eldred Habert and RGBDS contributors.
- *
- * SPDX-License-Identifier: MIT
- */
+/* SPDX-License-Identifier: MIT */
 
 // For `execProg` (Windows is its special little snowflake again)
 #if !defined(_MSC_VER) && !defined(__MINGW32__)