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Copyright Industry Wants To Apply Automated Blocking To The Internet’s Core Routers
(www.techdirt.com)
This is a most excellent place for technology news and articles.
How do they know what qualifies as "encrypted" vs a binary blob that could be a photo or something?
File headers, magic bits, all sorts of stuff. Plus you can (and they do) try to load common file types, so if a PNG isn't loading correctly, it fails the test.