Make sure that we can use our own copy_binaries in the future

gen_initramfs.sh

@@ -4,7 +4,10 @@
 CPIO_ARGS="--quiet -o -H newc"
 
 # The copy_binaries function is explicitly released into the public domain to
-# encourage wide adoption and re-use.
+# encourage wide adoption and re-use.  That means:
+# - You may use the code of copy_binaries() as Public domain outside of genkernel
+# - Past and future changes to copy_binaries() still need to be licensable under
+#   <GPL v2 or later> to maintain license compatibility with genkernel itself
 # Written by: 
 # - Robin H. Johnson <robbat2@gentoo.org> (complete rewrite)
 # - Richard Yao <ryao@cs.stonybrook.edu> (original concept)