Copyright in self-made GDTF fixtures

[Tharmin]

I'm new to GDTF, and would like to use the services to design fixtures for my own use.

I would like to use my created fixtures in BlenderDMX to render music videos for commercial purposes, as it seems manufacturer designs on GDTF are copyrighted and not available for use.

However, some copyright issues are unclear to me:

• Do I possess the right to declare my designs in the Public Domain?
• Do I possess the right to use my uploaded designs, free of charge and for commercial purposes?
• What rights are retained by me, as the designer?
• If I lose my right to utilize the GDTF files in the manners above and/or distribute them under my own terms, am I allowed to create files without uploading them, to be exempt from such limitations?