The coffee license is in fact not a license. It's a copyright waiver or anti-copyright notice dedicating works into the public domain. Inspired by Beerware, The Unlicense, SQLite and the CC0, it's a way of opting out of copyright laws and enabling anyone to do anything with your work.
The coffee license, its text and its name, is in the public domain and can be used freely. The source code and content of this website are also in the public domain. If we meet in person and you like this work, you may buy me a coffee.
~ chjlsch