You're absolutely right. This is why the Creative Commons organization created CC0 in the first place to get around the differing and/or vague implementations

You're absolutely right. This is why the Creative Commons organization created CC0 in the first place to get around the differing and/or vague implementations of "public domain" [0]. As the author is most likely American and talking about Americans, I think my critique still mostly holds but you're absolutely right that once we go internationally it gets much more complex. I only know of the Berne Convention [1] but doing some superficial research, it looks like their "fair use" doctrines are overly vague [2]. [0] https://wiki.creativecommons.org/wiki/CC0_FAQ#What_is_CC0.3F https://wiki.creativecommons.org/wiki/CC0_FAQ#What_is_CC0.3F [1] https://en.wikipedia.org/wiki/Berne_Convention https://en.wikipedia.org/wiki/Berne_Convention [2] https://en.wikipedia.org/wiki/Berne_three-step_test https://en.wikipedia.org/wiki/Berne_three-step_test