Another thing to remember about the #OGL is how I think it was shaped by two events of the '90s.
First was the start of Wizards of the Coast. The Primal Order, their first product, resulted in a lawsuit from Palladium Games because they included conversion appendixes for a variety of RPG systems. (TPO was a "capsystem" product meant to be added on your game of choice.) This is exactly the sort of thing that people are now claiming is obviously fair use. It was not so obvious, Wizards well knew!
The threat was so grave and existential that a new corporation, Garfield Games, was formed just to publish Magic: The Gathering, so that it could get investment that would not be threatened by the possibility of the whole company being destroyed by the Primal Order litigation.
After the TPO suit was settled out of court, Garfield Games was merged into Wizards of the Coast. The people who ran WotC in 2000, such as Peter Adkison, know personally how much water the "this is fair use!" argument
held in actual pragmatic fact for a publisher. All it took was one game company to decide they disagreed that it was fair and were willing to file suit over it.
The second event was the near bankruptcy of TSR. Again, key people (such as Ryan Dancey) involved in rescuing D&D from the implosion of TSR by facilitating its sale to WotC, had that experience to inform the creation of the OGL. It was not impossible to imagine D&D being owned by some corporate entity that did not care about it;
business owning work for hire had unwound, or no one had saved a paper trail of rights ownership/transfer. (Can you tell if it's work for hire?) As with fair use and game rules, there was a big difference between theorizing about the legal status of some work and putting your financial well being on the line by seeing if anyone will step forward and assert a right to sue you about it.
The OGL was a way to ensure that core RPG mechanics of D&D would be available to future generations --
regardless of whether they already are via fair use (yet to be tested in court), and regardless of what may be the future ownership of related copyrights. Stop the uncertainty.
Make games. Create things. Share them. Know that when you are hit by a bus, your asshole cousin who inherits your copyright will not have grounds to sue the guy who added your novel Prestige Class to his game world for sale as a PDF on DTRPG.
I disagree that it is revocable, and I don't think any rights are given up because the SRD contains zero product identity. Product identity designation is a carrot to encourage publishers to use the OGL without fearing that they were giving up their original content.
So why do it? Peace of mind. Safe harbor. And a way to pass it forward by designating OGC that others in turn can use.
@mcv But you have to DESIGNATE product identity, to identify specific things inside your Open Game Content that you reserve as proprietary.
So I might say: This game description & stats for Mickey Mouse is Open Game Content. The name "Mickey Mouse" is Product Identity.
Then it is clear that I can rename that character to be Rodney Rodent and put him in my world, but I can't use Mickey Mouse without getting a license.
Could I make Mickey Mouse a character in my game world under fair use?
@mcv "And whatever any of us think about what's legal or not, and whether it's revocable, is ultimately irrelevant."
It's not though, because I am a publisher and I am making decisions of what risks to accept in my business. I am comfortable on the risk of publishing material derivative of clearly labeled Open Game Content. I have decided NOT to publish things that I think are 100% legit Fair Use because I felt the odds of being sued by a known vexatious litigant outweigh the likely profits.
John Nephew
Martijn Vos