> does that mean an edited image (eg cropped or resized) wouldn't be detected?
Depends on the hash, and I also wouldn't be surprised if "fingerprint" turned out to be a more accurate term. This is a PR document, after all. ;) You can normalize things like resolution and color balance, and create a hash/fingerprint that's a concatenation of hashes for portions of the image, which would allow some degree of useful comparison despite many kinds of changes. Similar techniques have been used to detect copyright violations as well, so there are technological precedents. The real question is implementation quality.
Depends on the hash, and I also wouldn't be surprised if "fingerprint" turned out to be a more accurate term. This is a PR document, after all. ;) You can normalize things like resolution and color balance, and create a hash/fingerprint that's a concatenation of hashes for portions of the image, which would allow some degree of useful comparison despite many kinds of changes. Similar techniques have been used to detect copyright violations as well, so there are technological precedents. The real question is implementation quality.