My first thought is that WotC has a contractual relationship (licence) with A which permits A to issue sub-licences, and then you have a contractual relationship with A which also establishes the sub-licence. Because I don't think you've taken up WotC's offer, you've taken up A's.It is early in the morning for me & I'm still sleepy, but I think if I take material from say The Hypertext d20 SRD (v3.5, 5e & Pathfinder d20 System Reference Document) :: d20srd.org under the OGL I would be held to have a contractual relationship with WoTC, as well as with the d20SRD.org people, and with everyone else whose d20 game material I took. I think this is what Umbran means by calling the licence offer non-revocable.
But you think I'm wrong?
 
				 I am sure a lot of work has been done in this area especially by the Open Source movement.)
 I am sure a lot of work has been done in this area especially by the Open Source movement.) I do get the impression that modern US contract Law puts a bit less emphasis on the technicalities of Offer & Acceptance than classical English Contract Law, which may make this less of an issue for them.
 I do get the impression that modern US contract Law puts a bit less emphasis on the technicalities of Offer & Acceptance than classical English Contract Law, which may make this less of an issue for them. 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		