I don't think this document has anything contrary to existing knowledge, but it does emphasize another significant reason that WhatsApp is not a great choice fo

I don't think this document has anything contrary to existing knowledge, but it does emphasize another significant reason that WhatsApp is not a great choice for privacy despite the use of E2EE. They readily hand over substantially more metadata, and while this is less likely to be enough evidence to convict someone of anything it is more than enough to seriously compromise privacy. > Search warrant: Provides address book contacts and WhatsApp users who have the target in their address book contacts. > Pen register: Sent every 15 minutes, provides source and destination for each message.