Hm, good point. I was thinking of the case of manual checking, but good point nonetheless.
Of course, the checksum would have to be invariant to pitch shift, rotation, horizontal flipping, framing, clipping, and length changes — all of which I know have been used to evade copyright filters on YouTube. (Also must resist mild noise audio or visual noise, mild convolution filters, and probably hue shifting, but I don’t know if those have been used by pirates yet)
Of course, the checksum would have to be invariant to pitch shift, rotation, horizontal flipping, framing, clipping, and length changes — all of which I know have been used to evade copyright filters on YouTube. (Also must resist mild noise audio or visual noise, mild convolution filters, and probably hue shifting, but I don’t know if those have been used by pirates yet)