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thought process and abstraction cannot have a registered copyright (or patent, sorta), no, but you can still get sued for copying an idea. the legal idea is substantial similarity, and in the US (or countries part of the WIPO treaty) you can get sued for it, however rare. you can get literally sued for anything, and if you don't show up you lose automatically. what's more; the OGL is a trade agreement, a contract, and agreeing to it's terms supersedes on-the-street copyright code. so if you're using the OGL you agree to not do shit you would normally be able to otherwise, like how you cannot claim compatibility using proper nouns and are limited on the reproduction of procedure, etc. what WotC does and does not choose to enforce has no bearing on how it actually works.