I can't find evidence that Atari registered a (C) for Atariwriter - a ledger of ownership is so "important" large corporations don't bother to record their intangible property in any ledger anywhere.
https://publicrecords.copyright.gov/name-directory/Atari%2520Games%2520Corporation/associated-records *
not a compete list of Atari's copyrights
Forget about uneditable ledger, the ledger is just a general threat of lawsuits.
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