Quote Quoting flyingron
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I would tend to agree with you in principle, but it is not incorrect. The OED shows the use as a verb going back to the 1800's.
Prior to 1/1/1978 it was properly used as a verb because, under the Copyright Act of 1909 (the predecessor to the Copyright Act of 1976) and the earlier Copyright Acts, copyrights did not exist (at least not at the federal level) in the absence of formalities.

Typically, when folks use "copyright" as a verb, they are talking about registration.