Creative Commons BY-SA
My work as a copyist is freely available in an open format, and the LilyPond program itself is Free Software. As far as I'm concerned, you can download both the source code and the rendered PDFs, or generate these from the former, for your own personal use.
Know more about this tool for creating beautiful music scores
Go to lilypond.org official site
About this page
lilypond.es is a poorly maintained, unofficial blog about LilyPond in Spanish language.