this post was submitted on 19 Sep 2023
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Lemmy
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For discussion about the lemmy.ml instance, go to [email protected].
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Are any of the examples that your provided libre/free and open-source? I wasn't able to find any info for Google's, and Cloudflare seems to only offer theirs for free if you are already using Cloudflare's services. If not the examples that you provided, does there exist any tools that are libre/free and open-source?
No.
The nature of the checksums and perceptual hashing is kept in confidence between the National Center for Missing and Exploited Children (NCMEC) and the provider. If the "is this classified as CSAM?" service was available as an open source project those attempting to circumvent the tool would be able to test it until the modifications were sufficient to get a false negative.
There are attempts to do "scan and delete" but this may add legal jeopardy to server admins even more than not scanning as server admins are required by law to report and preserve the images and log files associated with CSAM.
I'd strongly suggest anyone hosting a Lemmy instance to read https://www.eff.org/deeplinks/2022/12/user-generated-content-and-fediverse-legal-primer
The requirements for hosting providers are https://www.law.cornell.edu/uscode/text/18/2258A