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WebCopier and EmailSiphon are among the relatively few agents with names describing exactly what they do. They're also among the first agents I banned.
If you've not already added both of those to your blocks, do so ASAP. And if you want to see a long list of UAs you don't want to see, here you go (read to and fro'):
A Close to perfect .htaccess ban list - Part 3 [webmasterworld.com]
More tips and tricks for banning those pesky "problem bots!"