PDF lock

Hi @Charles22982237okk3,

I hope you are doing well and am sorry to hear about the issue you are experiencing.

We need some more information for a better understanding:

Have you placed the security password on the PDF using the Adobe Acrobat Mobile application? If that's the case, then it can be achieved with the help of the Acrobat DC desktop application, only if you are the owner/creator of the pdf and have the rights to edit the security. You can refer to the help document to know the exact steps-Securing PDFs password, but this functionality is currently unavailable in Adobe Acrobat Reader's mobile application.

Let us know if it works out for you.

Thanks,

Bhupesh

This is not possible with Acrobat Reader for iOS.

Use Adobe Acrobat on a Mac.