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Message: <blockquote data-quote="Umbran" data-source="post: 8894675" data-attributes="member: 177">Yes, but......there is always a but...In game rules, there is no "bright line" between what is copyright protected IP, and what isn't.  While it is true that mechanics can't be covered by copyright, specific expression of them can.  What counts as the concept of the mechanic, and what counts as specific expression of the mechanic, has not been made clear.The original purpose of the OGL was largely to skip past figuring where that line was - you can use the mechanic and the SRD's specific expression of the mechanic, if you follow the license.  If you really want to risk following Justin LaNasa, and go up against WotC in an IP lawsuit, you could not use the OGL.  But the OGL basically eliminated that risk.</blockquote>