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All the document is FDL (like the GPL from free software, but for documents). The source code is made with LYX (dn.en.lyx), and uses the macros fitch.sty by Johan W. Klüwer. I have used the program latex2html (slightly patched) to create the web pages.
You have the right, among others, to modify it or to translate it to other languages which you know well, and also to redistribute it, sell it, and more.