A PDF owner password, aka PDF master password, restricts how someone can use the document.
In Adobe Acrobat, this is called thechange permissions password.
What Does a PDF Owner Password Do?
How Do I Stop Someone From Opening a PDF?
FAQ
In Windows 11/10,open File Explorerand locate the PDF file.
Right-pick the file and selectProperties>Detailsand look for the Owner field.
Toremove a password from a PDF, you’ll first have to sign in and open it.
Then selectTools>Protect>Encrypt>Remove Security.
