Someone once explained to me that .pdf and Microsoft office encryption have the use case of 'someone benevolent gets the file by accident (browsing a network dr

Someone once explained to me that .pdf and Microsoft office encryption have the use case of 'someone benevolent gets the file by accident (browsing a network drive maybe) opens it, sees the password screen and knows they're not supposed to read it, and gives up. It's more the equivalent of putting it in an envelope marked Private and Confidential than locking it in a box. In many of these cases the password is in the email the file is sent with.