Open the PDF in a browser or PDF reader and try the correct password
Check the file properties or source for any provided password
Ask the sender or owner to remove the password or share an unlocked copy
If you know the owner password, use a PDF editor to remove restrictions
Use Adobe Acrobat or another PDF tool to unlock the file with the password
If it is your own file, restore an unprotected backup copy
If the PDF is print-restricted or copy-restricted, use the owner password to change permissions
If the file is encrypted with a certificate, open it with the authorized certificate or account
Use an authorized document management system if the PDF came from one
If you cannot access it legitimately, do not attempt to bypass the protection