The Libre art a4 project collects all
Libre art licenced _source codes_ of
music, vector graphics, any texts etc ...
printable to a4 or similar paper
You can use it under CC-BY-SA, GPLv3 or any strong copyleft license
or is you use it under PD, please try to inform the author within 90 days.
You can find all this information in the source code.