Plans
A plan changes one thing: how many documents you can send each month.
What a plan does not change
Every document gets the same protection on every plan, including free: its own encryption key, inbox confirmation, instant revocation, expiry, and the full audit trail. We meter how much you send. We do not sell safety as an upgrade, because a cheaper tier that protects your documents less would make the whole promise dishonest.
And running out never touches what you've already sent. Recipients keep their access, and you keep the ability to revoke or delete -- on any plan, in any billing state. Locking someone out of revoking a document over an unpaid invoice would mean withholding a security control from the person who needs it most.