I don't think that is even remotely possible.
tigerflag@tigerflag.com spoke forth with the blessed manuscript:
> Does anybody in the list know anything about the feasability of copyrighting or
> trademarking an internet pseudonym? Reading CmdrTaco's story today on /. got me
> thinking about how personally attached I've become to my pseudonym.
>
> Been googling this but haven't come up with anything relevant.
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