Lawyerly question: If WotC is effectively trying to put an expiration date on the OGL 1.0a license (ie everything published before X date will continue to be publishable under that license but anything after X date cannot use the terms of that license to reuse, republish, or redistribute new material based upon the old material published before X even though WotC is saying that those works are not copyright infringing based upon the use of that license) how does such an idea interact with the idea of "Perpetual" in regards to the works that are considered non-infringing in WotC's eyes?
Does putting such an expiration date on a perpetual license (by creating works that are OK prior to X date and not OK after X date) create an additional conflict? (ie, does a "partial revocation" like this create additional problems?)
To me, it seems to depend on the proper construction of the contract: what is the precise scope of the power to sub-license that is granted to licensees, and how is that power regulated by other general legal principles?I kind of think that's an even weaker claim by them, since the licenses they granted include the right & duty to re-license all OGC on the same terms. If the old OGL 1.0a licences are valid, then that term is valid, too!
Edit: They're not claiming to revoke a perpetual licence. They're claiming to alter the terms of the licence post acceptance. That seems an obvious no-no.
Does this turn, in part, on property/IP law principles? Agency principles? Even sticking just to contract law I can see complexities:
Upthread (or maybe in one of the other threads) I noted that the terms of the OGL v 1.0/1.0a, which confer on the licensee a permission to use "the Open Game Content", are unclear as to whether that permission extends to all of the OGC that is in the SRD or only the OGC that the licensee actually uses in their work: ie is the OGC that is referred to in section 4 the OGC identified by WotC in its licensed work, or is it the OGC the use of which, by the licensee, constitutes acceptance for the purposes of section 3?
If WotC now revokes its standing offer to licence the text in the SRD that it has identified as OGL, does that affect the proper construction of the conferral of the permission conferred by section 4? Eg does "the OGC" mean "the OGC that is found in the SRD and that the contributor continues to offer to licensees under the terms of the OGL"?
I don't necessarily think that the above is a winning argument, but it's not necessarily hopeless either. I certainly think it's stronger than the (in my view) spurious assertion of a power of "de-authorisation".