Are you sure about that? From my layman's perspective, the OGL seems to make it impossible to release a work under the license in which a rule as simple as "roll 3D20 and use the middle result" is protectable content.
PI? dunno. closed? I think so. And so do the folks behind M&MM, T20, and a host of other games--and unless someone challenges them, it's likely to become established precedent (just like WotC's claims to ownership).
As I read that, it means that anything in an OGL work that constitutes a game mechanic can be reused under the license, regardless of whether the publisher has declared that the mechanic is open or closed.
If I recall correctly, we had a discussion here about what would happen if an RPG publisher included an original card game as part of an OGL work but did not declare it as open. The rules of the game would be open content, though the particular expression of those rules and the card images and name could be product identity.
Actually, IIRC, the conclusion was that you could not make the card game PI, so if it appeared within OGC it would have to be OGC, but you could make it closed content, and just keep it far away from any OGC.
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woodelf <*>
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