I wasn't envisaging suing on the strength of my letters! Just sending them out there and hoping they have a cowing effect!The problem for WotC (or another company using the OGL) would be that the respondent making a retro-clone etc can claim that copyrighted material they used was covered by the OGL, then the claimants have to pick out non-OGL material in the work, show that it's not OGL material nor derived from OGL material by the respondent, show that it's copyright protectable (substantial, not game rules/formulae, etc), and show that it's significant, not a de minimis infringement.
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4e rules mechanics are not protectable, and most of the fluff can be derived from the SRD, so a non-literal copy based off the SRD using the OGL may not be infringing. And you don't want to spend millions finding out.
(Well, in fact, I think I want the opposite - I like 4e and am unlikely, I think, to take up D&Dnext. But I find the legalities of the OGL strangely intriguing. One day I want you to tell me whether or not I'm crazy in thinking that Paizo is in breach of the OGL for only citing the original (year 2000) SRD in its Section 15 statement, despite using material from the 3.5 SRD.)
Only if I'm in it, for the above-mentioned reason!Is there an equivalent to Godwin's Law that states that the probability of any thread about D&D being about copyright law approaches 100%?