But the definition of Use relates to Derivative Material of Open Game Content, not Open Game Content itself.
I don't agree.
Use is relevantly defined as "use, Distribute, copy, edit, format, modify, translate and otherwise create Derivative Material of Open Game Content". I think the "otherwise" is referring to "otherwise than editing, formatting, modifying or translating". I don't think that it reaches all the way up the definition to govern "use", "Distribute" and "copy". Because (for instance)
copying OGC is not a mode of creating derivative material of the OGC, as best I'm aware.
If the OGL's leaning in part on the U.S. Copyright Office's definitions of "derivative works", then the intent might be to allow licensees to only sublicense any Derivative Material (derivative work) that the licensee contributed to the OGC, excluding the OGC material contributed by WotC, i.e. the material in the SRD itself.
I assume it's drawing on the statutory definition of
derivative works where it uses that phrase:
Chapter 1 - Circular 92 | U.S. Copyright Office
As far as the authority to sub-license is concerned, section 4 extends it to
the Open Game Content, which is not confined to the OGC that the licensee contributes (section 5 calls that out distinctly). At least, that's how it reads to me.
The community has long held that OGL 1.0 and 1.0a licensees have the right to continue using the SRD (any version published under any prior version of the OGL) and - in the hypothetical I've been referencing - the ability to sublicense SRD content to which WotC holds the copyright. Maybe that's right, but has it ever been tested in court? WotC now seems like it's in the mood to do just that.
I believe there are cases on software open source licensing. I don't know what they say, nor what they tell us about the OGL v 1.0/1.0a.
The hypothetical that sparked this part of the thread contemplated that an OGL 1.0a licensee could sublicense OGC found in the SRD in perpetuity, provided that the licensee had published SRD-based OGC prior to the "non-authorization" (to use your term) of the OGL 1.0a . That's the scenario I've been asking about, anyway.
My view is that WotC would somehow have to revoke the licensor's rights to sub-license to others. Given that those rights are contractually granted, I'm not really seeing how that would work. There's been some more discussion of this, through a contract law lens, in the "PSA" thread.
The best post there, in my view, is this one:
Hello, I am lawyer with a PSA: almost everyone is wrong about the OGL and SRD. Clearing up confusion.
That poster says the following:
as a matter of contract law, an offeree is generally permitted to terminate an ongoing offer. I can imagine that WOTC could announce "no more licensees" under the OGL and a court might enforce that, but it would not affect the current licensees who have accepted the terms of the OGL. Its not clear as a practical matter WOTC would prove that someone has not previously accepted the terms of the OGL. Its also not clear how this would affect sub-licensees who take a license from an existing licensee.
I'm not able to take the analysis any further than this -
@bmcdaniel is a better US contract lawyer than I am.