[kevin_b_er]

A modern read-protected Office document is AES encrypted, so you cannot read those at all. But the read-only one, much like PDF do-not-print/do-not-copy protections, is just relying on the viewer to honor the protection marker.

[lazyeye]

Yes I think you can just save the readonly doc to a new writeable doc anyway.

[subroutine]

If that is true, what is the point of this password remover?

[pjbeam]

Sometimes document provenance matters and you don't want a copy.

[dev_tty01]

Hmm. I don't really get that. If document provenance matters, don't you want to keep it read only?

[dmurray]

Or append-only (think Git)