As of March 1989 it is unnecessary to make a claim for copyright in the US.
Yes...., but that doesn't mean it's valid to willingly make
an incorrect claim 
. Furthermore, if you sue for damages if
there has been a copyright infrigment, you greatly reduce
your chance of collecting damages if you didn't make your
 With that statement, I'm not saying that
putting a Copyright © 2004 statement in a book
that's published at the end of 2003 is an invalid claim.
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