The files in this collection are from the hands of Ejiwa Ebenebe, Luigi Castellani, Miguel Santos, Mohammed Agbadi, and Pamela Ngououghe. All of them are released into the public domain, free for use in personal or commercial projects. As a matter of courtesy, I would request that you leave their names attached to the file names and keep this collection together when you redistribute it so that end users can be confident that the art really is in public domain.

If such is impractical, you should leave a note with the files advising that the art was released on April 22, 2013, by Kevin Crawford acting for Sine Nomine Publishing. While you are under no obligation to do so, it will help give uncertain future users some reference as to when and how exactly the files entered the public domain.