Question about use of open gaming content

[Skywalker]

The Open Gaming License not only defines Open Game Content (or OGC), but also defines Product Identity (or PI). It also states that any designated PI and trademarks owned by someone else cannot be Used by others without permission from said owner.

Just make sure the content in question is not derived from previous OGC or anyone else's copyrighted material before you can designate as PI.

If you wish to identify them, do so either before or after identifying OGC. If you need help with the words, and this is serious advice when it comes to licensing, consult with a lawyer.

Ranger REG has it right.

I also note that as if there is any doubt then it is safer (and the common practice) to designate it OGL. That is why most publisher designate most mechanical content as OGL. So even considerably altered mechanics that are plugged into the mechanics are OGL, such as Mutants and Masterminds and True 20. If you get it wrong then you are in breach of copyright.