Look into these websites:

http://creativecommons.org/
http://www.opengamingfoundation.org/ogl.html

System Legal:
Any systemic elements may be used freely in either profit or not-for-profit work. Also any.

Setting Legal:
Contact the author before using any setting elements in for-profit work. Any non-profit work (either

Copying, re-posting, and money – don’t sell this stuff unless you’ve obtained a license from me. Copying for personal use is acceptable. Selling copies is not. Filesharing?

You can make use of terms within this setting or system with impunity though.

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