My name is Eric Duckworth. I stumbled upon this forum looking for d6 books.
I want to weigh in on this topic with for a minute. I've been "with" the OGL since it's inception. I did self publish under the name Black Hole Hobbies one book for d20 Modern, but only after several years of watching the OGl license be created and refined. On the matter at hand (GM Screen PI owned by Mr. Bernstein), he is correct. But, I would actually suggest that instead of releasing the material as open content, he should have the Prodict Identity section be updated to state "Chapter 1: Creating your Own World, is copyright 1996, Precis Intermedia and not released as open content."
This solves the issue and protects the PI of his product.
Hope this helps!
-Eric Duckworth, Gamer at Large!