Here's a first crack at revised attribution language. When the language is completely finalized, I'll send a separate note explaining some of our reasoning for this general approach in more detail. In the meantime, I'd appreciate it if you could point out any bugs in this specific language, given its intent which should be self-evident. To keep the discussion focused, please read it from the perspective of a "from scratch" attribution model, i.e., imagine that a new encyclopedia wiki that you'd contribute to had these terms. Which problems would they cause? Are there specific third party uses that would be significantly hampered by these terms?
Thanks for any constructive feedback, Erik
Attribution: To re-distribute an article page in any form, provide credit to the authors either by, at your choice, including a) a link (URL) to the article or articles you are re-using, b) a link to an alternative online copy which is freely accessible and conforms with the license and includes a list a list of all authors, or c) such a list of all authors. (Any list of authors may be filtered to exclude very small or irrelevant contributions.) Rich media (images, sound, video, etc.) that are the result of substantive collaborations between at least five people can be credited in the same fashion, but must otherwise be attributed in the manner specified by the uploader. These attribution requirements apply to content developed and uploaded by the Wikimedia community. Text and rich media contributions that come from external sources may attach additional attribution requirements to the work, which we will strive to indicate clearly to you on the article or the description page for the file(s) in question.