in reply to (OT) Who can use freely available material?
IAMNAL
I believe you are correct in that you do have some protection in US Copyright for your work, but I also believe that you have stronger ones if you specifically claim copyright protection, as well as the rules for mirroring or linking to your work.
This may be a question better posed to either our Monk in Exile or to the people on this site, who are (if not lawyers) at least knowledgeable in those areas. Better yet, you can get some guidance for free.
In the mean time, you might email the mirroring sites and politely ask them to replace their copies with links to your pages. After all, they probably want to make sure that they're sending people to the latest and greatest revisions.
--f
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