P.S. I noticed also there the frase "Wikipedia also uses text under the fair use doctrine. However, what is fair for us to use may not be fair for your intended use of the text. " That troubles me a bit.

What is meant here, is a situation like the following: Let's say John Doe is a famous poet who wrote many poems about the sea. If we write a Wikipedia page on John Smith, we may include one of his poems (provided it is not too long) to show the reader the style and such that John Smith is using. That would be 'fair use'. However, placing the same poems on our site in another context (for example in a page on the sea he is talking about), or absent of any context at all, would not be allowed.

Normally under the GNU/DFL, someone would be allowed to takes a little part of Wikipedia, or several parts, and publish that as a derivative work, provided he did that under the GNU/DFL as well and gave Wikipedia due credit. But he would not be allowed to do the same with the poem on the John Doe page. He would be allowed to publish the page as a whole, but not the poem alone or with very little additional text.

Andre Engels