Publisher's blurb:
The Prometheus gaming project has but one goal: to offer a more open alternative to the d20STL offered by Wizard of the Coast, Inc.
To that end, we have developed a logo and license for use with the OGL that would allow publisers to declare compatibility with other Prometheus works without asking that the publisher to censor his work.
The Prometheus license only asks that the published work be compatible with the documents known as the PRD's and be released under the OGL.
The Prometheus license offers publishers security. The licensee may use any version of the license that they choose, even older versions. Use of the logo by a licensee is granted in perpetuity as long as they follow the rules of the license.
The Prometheus license offers publishers freedom. The Prometheus license contains no terms that restrict the contents of covered works.