I have PDF's that I've opened and edited before, but now some (not all) are password protected so I can't delete or add pages, etc. I am using MacOS 11.6.2, Preview application. I have never put a password on any of them.
MacBook Pro
There can be two types of passwords set on PDFs. An overall document opening password, and a password set to prevent document changes that presents a password challenge when you attempt to change PDF content.
Preview does not automatically set either password on a PDF, and you deny doing so. That leaves someone that you shared the PDF with as the originator of the password.
The PDFs that can not be opened because of Password Lock are from what source ?
+1 :-)
PDF protected by password, but I didn't create one!
