DEVONthink Pro Office 2.8.4 Documentation, page 27

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Encryption for Sync over WebDAV

When Sync starts synchronizing your database, it generates a random encryption key to encrypt your database. All records, record metadata, etc are encrypted with that key (call this the primary key). Then that key is encrypted with another key generated by the username and password (if any) set for your database (call this the secondary key). If the primary key ever changes, the entire contents of the sync store need to be deleted and recreated. So we never change the primary key. Instead, …