I know of at least about 15 files, which have a verified and verifiable license.
They are my own works, though
works in english:
- dragons lament
- magock
- parentcurse
- wind-to-thy-wings2
works in german
- drachenklage
- frankfurt-haie-otakus
- dildo-backenspalter
- harpie
- jan-waechter-koll
- ignisphaero
- nymphe
- saengerin
- schimmel
- ueberfuellt
- weltentor-fuer-kinder
Just search for the names. You should find at least some of the files