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@ skreuzer The keyword here is "social".
If it's non intrusive a fair user has no interest in removal.
An unfair one needs nothing but two copies from varying users, diff in a shell and some braincells.
Might even have own interest in keeping unique markers on own stuff.
Think: name on clothes/personal logos/wallpapers on devices etc.
A QR encoded but not first-sight in plain view embedded identifier is subtle, machine readable and thanks to the rising spread of smartphones yet easily accessible to humans.
embedding it as svg code inside existing SVGs makes it at least partly resistant to non intended damage, math games with timestamps are the direct counterexample of resistance. A wee typo correction or inclusion of a custom meta data field is highly likely to screw the identifier up.
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