For release notes and other info pointers:

  http://sites.google.com/site/fullycapable/

See GIT repository for detailed source history

  https://git.kernel.org/cgit/linux/kernel/git/morgan/libcap.git/

Or simply download the source:

  git clone git://git.kernel.org/pub/scm/linux/kernel/git/morgan/libcap.git

The license for this library is here:

  https://git.kernel.org/cgit/linux/kernel/git/morgan/libcap.git/tree/License

please submit patches compatible with this to morgan at kernel.org.
