I am trying to remove the security on a document but it asks me for my password. I have typed my login password several times carefully and it keeps telling me it is wrong. I even changed my password to be sure, but no luck.
When you secure a document you must enter a password. When you remove the security you must enter the same password.
The password is per document, it has nothing to do with your login (unless you used your login password to secure a document). If someone else secured a document you cannot remove security. The person who secured it needs to give you the password. A PDF file may have two passwords: one to open this PDF ("Open" password) and one to change/remove permissions ("Permissions" password). A PDf may have either one or the other or both. You need the "Permissions" password.