This is almost 100% wrong. The d20 license did not require the concurrent use of the OGL. They were seperate licenses that both allowed access to the open game content in the SRD. You are correct that the d20 STL also allowed the use of the d20 logo and trademark. However, the license also came with a number of additional restrictions, including that products released under it couldn't include a character creation, stat generation or XP advancement system and that numerous terms and mechanics couldn't be modified from their definitions in the SRD. There were MANY products released with the OGL which could never be used in conjunction with the d20 STL (any complete game like Mongoose's Conan or Green Ronin's Mutants & Masterminds for example), because they didn't adhere to those restrictions.
Which, ultimately, is the best argument against the statement that the OGL was never intended to allow for competing games to be produced using the rules in the SRD. If that was never intended, then the d20 STL would have been the only license necessary. The only reason to have a more open license like the OGL is specifically to allow competing game systems to be made.
The d20 STL gave access to OGC (including the SRDs) on its own. You didn't need to use the OGL in a d20 STL product in order to access OGC. Using the OGL in a d20 STL product would have been redundant.The OGL could be used alone to gain access to the SRD and any OGC available. The d20 STL could be used in addition to the OGL with some extra restrictions and benefits.
The d20 STL gave access to OGC (including the SRDs) on its own. You didn't need to use the OGL in a d20 STL product in order to access OGC. Using the OGL in a d20 STL product would have been redundant.
It might not look like it does at the moment, but WotC has a limited perspective. Normally any sort of license a company creates would share a similar limited perspective, but the OGL doesn't. That's the brilliant part. WotC was able, as a company, to create something that benefitted and empowered the community more than themselves. I believe, over time, the OGL will do more to keep the RPG community alive and vital than any other single "event" since the creation of D&D. And that will be good for everyone.
Without a community, there will be no WotC.
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Yes, I know. That's what I meant by "redundant".Note the mandatory requirements on page ten of this document -
http://www.necromancergames.com/pdf/d20stlreview.pdf
The d20 STL gave access to OGC (including the SRDs) on its own. You didn't need to use the OGL in a d20 STL product in order to access OGC. Using the OGL in a d20 STL product would have been redundant.

From the Open Game LicenseMandatory Requirements:
A minimum of 5% of the text (word count or letter count) of a Covered Product must be Open Game Content and must comply with the terms of the Open Gaming License version 1.0a.
Find me a definition of Open Game Content in the d20 license. Find me any of the terms of the OGL defined in the d20L. Find me 3 products that used the d20 license and not the OGL.10 Copy of this License: You MUST include a copy of this License with every copy of the Open Game Content You Distribute.
Absolutely correct. In order to use the d20 logo, you had to meet a number of restrictions and requirements, including conforming to the OGL in all regards.You are correct that the d20 STL also allowed the use of the d20 logo and trademark. However, the license also came with a number of additional restrictions, including that products released under it couldn't include a character creation, stat generation or XP advancement system and that numerous terms and mechanics couldn't be modified from their definitions in the SRD.
Except that the d20 license was an add-on to the OGL, not a stand-alone license.Which, ultimately, is the best argument against the statement that the OGL was never intended to allow for competing games to be produced using the rules in the SRD. If that was never intended, then the d20 STL would have been the only license necessary. The only reason to have a more open license like the OGL is specifically to allow competing game systems to be made.
The bolded part is where the d20 License comes in. It is "another, independent Agreement" with WotC.7. Use of Product Identity: You agree not to Use any Product Identity, including as an indication as to compatibility, except as expressly licensed in another, independent Agreement with the owner of each element of that Product Identity. You agree not to indicate compatibility or co-adaptability with any Trademark or Registered Trademark in conjunction with a work containing Open Game Content except as expressly licensed in another, independent Agreement with the owner of such Trademark or Registered Trademark. The use of any Product Identity in Open Game Content does not constitute a challenge to the ownership of that Product Identity. The owner of any Product Identity used in Open Game Content shall retain all rights, title and interest in and to that Product Identity.
This is pretty redundant now. But you are completely wrong.This is almost 100% wrong.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.