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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
You might look into locally sensitive hashing. Here's some software I found with a quick search
I've used Video Duplicate Finder for this before. (Yes, it works on images, supposedly). It's pretty buggy but it does the job.
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