The only thing that would cause a problem with 'Copyright Sisyphus' is that you are assuming the default copyright terms: No one but you is allowed to make or distribute copies.
That's only true in a few countries. In most countries, including the past 20+ years in the USA, the mere fact of creating the work makes it copyrighted. Absence of a copyright notice does not mean there's no copyright.

You may only assume a work isn't copyrighted if either the copyright has expired, or if it's explicitly stated the work is placed in the public domain.

In reply to Re^2: Copyright notices in modules by JavaFan
in thread Copyright notices in modules by syphilis

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