Hi Eric, which means there is something about the use of @ref within @copying that messes up makeinfo.
Sad, although I'm not surprised. @copying is a weird beast. Is this worth fixing, so that the copyright page can have a hyperlink to the FDL rather than just a textual reference? In my opinion, no :). Anyone who wants to find the FDL is not going to have any trouble doing so. I'll put it on the "someday" list. Meanwhile, I think the plain old text reference will do. Thanks, Karl