If you want to contribute code, it must be made public domain. (See
UNLICENSE file in source code.)

In the commit message for every contributed patch:

1. Use git's Signed-of-by feature (git commit -s) with your real name
   and email address. Signed-off-by should match the git author.

2. Include this message:

I dedicate any and all copyright interest in this software to the
public domain. I make this dedication for the benefit of the public at
large and to the detriment of my heirs and successors. I intend this
dedication to be an overt act of relinquishment in perpetuity of all
present and future rights to this software under copyright law.