Count_Zero
Adventurer
Well, I thought I was out, but I do have a slight clarification - there were two TSR vs. Mayfair Games cases. The initial one for the Role Aids line, in 1984, was pre-Williams and the settlement from that case set conditions for which Mayfair could state on the packaging that those products were compatible with AD&D.I was going to mention this too. TSR suing Mayfair predates Williams
The 1992 case, which was under Williams tenure, was initiated by the Mayfair Games version of City-State, which has a forward by Gygax, and the cover stated "With a forward by Gary Gygax, Creator of Advanced Dungeons and Dragons", but in a way which didn't fit the earlier agreement for the Role-Aids line (possibly due to the different context).
Source: TSR vs Mayfair Games