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A comment on Google Blew a Ten-Year Lead. Parent comment

Re:Google Blew a Ten-Year Lead by virtue3 on Wednesday June 24, 2020 @01:21PM (#23630947)
how would they check the HASH of a document for unlawful material?

I think the complaint was they scan your entire doc, for all it's content.

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Re:Google Blew a Ten-Year Lead by joshuamorton on Wednesday June 24, 2020 @01:41PM (#23631225)
> HASH of a document for unlawful material

This is ~super common with things like copyright violations and child porn. You store a database of hashes of copyrighted or pornographic data. And specifically you can use visual-similarity hashing to detect even somewhat perturbed documents.

(https://en.wikipedia.org/wiki/PhotoDNA)

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