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It is almost as if calling it "confidential" may be misleading.

It matches the name of an existing Outlook/Exchange feature that people have used for many years. Naming it anything else would have been confusing.

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-...

Both Google and MS provide a disclaimer that explains Information Rights Management can't prevent "malicious programs" from by bypassing the restrictions.

Sounds exactly like confidential content works now, except with more than red text saying "confidential" on slides or similar.

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