Automatically Locked PDF files when password was never set

Hello saghi32,

Thanks for reaching out to us in Apple Support Communities about using a password with Pages documents, we're happy to help by looking into this more! 

The following support article provides some additional information about this option, and how to remove the password:

Password-protect a Pages document on Mac

Hope this helps.

Best Regards.

Original Posting from Original User wrote " I recently purchased the new 2020 MacBook Air version 11.1 MacOS Big Sur. Every Pages PDF file I create automatically locks and when I try to edit the PDF I get this automated response "

As @c_luc9 posted a link for Pages file with a Password and Exported to PDF format will have the Password included in the PDF.

The original question didn't ask about "Pages" documents - it asked about PDF documents. And I have the same issue - I was just sent a document via email that I need to sign. But when I try to drag in one of my signatures in Preview, it tells me that I can't annotate the document without the owner's password. The owner says they didn't set any password.