In Outlook's docs, they also refer to it as "IRM-protected mail", which seems clearer to me. https://support.office.com/en-ie/article/mark-your-email-as-normal-

In Outlook's docs, they also refer to it as "IRM-protected mail", which seems clearer to me. https://support.office.com/en-ie/article/mark-your-email-as-normal-personal-private-or-confidential-4a76d05b-6c29-4a0d-9096-71784a6b12c1 https://support.office.com/en-ie/article/mark-your-email-as-... Both Google and MS provide a disclaimer that explains Information Rights Management can't prevent "malicious programs" from by bypassing the restrictions.