[Wiki Loves Monuments] Copyvio checking

[Racso]

Hello.

I have detected that a participant just uploaded photographs he found on
internet, so I must proceed to mark them for deletion. Sigh.

My question is, Does someone know about any [semi-]automated tool to verify
if uploaded images already existed? I use Google image search, but that
tool requires checking single images at a time.

Thanks,
Racso
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