In this case, 'hash' doesn't necessarily mean 'a cryptographic hash of the raw file contents'. There are perceptual hash techniques which still match after cha

In this case, 'hash' doesn't necessarily mean 'a cryptographic hash of the raw file contents'. There are perceptual hash techniques which still match after changes to the file, and are tuned in a similar manner to lossy compression algorithms to prioritize comparing information relevant to human perceptions. https://www.phash.org/ https://www.phash.org/ is one open-source example.