"Legal issues and disclaimers. All these files are copylefted. If you have any use for them, please use them. You are also free to make copies of them for yourself and make copies to be distributed free of charge to other people, provided that you include a copy of this README file and share copies of these files for free with anyone who asks you for them.
IANAL, but it sounds to me like this is incompatible with GFDL, since this would only allow redistribution free of charge. Under GFDL, the documentation may be sold.
Quoting from the Wikipedia page on GFDL:
"Materials for which commercial redistribution is prohibited can not be used in a GFDL-licensed document, e.g. a Wikipedia article, because the license does not exclude commercial re-use. "
-Rich Holton (Rholton)
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