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Discord says piracy subpoena would violate users’ First Amendment rights
(www.theverge.com)
This is a most excellent place for technology news and articles.
Like I said, Discord can still be compelled to let feds join the server, thus receiving the PKIs.
If the the pki is generated by users client side by a secret discord doesn't control it wouldn't be an issue.
Either you share the message history to new users (which includes feds) or you don't have any history. I don't understand what you mean
The server provides the data to authenticated users and helps facilitate pki between the clients.
If someone is added by the server to have access to the data but wasn't given a key capable of decryption by an actual user they wouldn't have actual access, just encrypted data.