Once it is decrypted, I don't want further restrictions.
PDFINFO MARRKET MANUAL
#PDFINFO MARKET K601 SERVICE MANUAL MANUAL# It includes descriptions of the ESCI competencies and guidance on their use. I just want to encrypt a PDF, preferably with a single password. Indeed, perhaps it would be a good idea if I started with my use case. Hopefully this explains the behavior you are seeing. I believe that older versions of Adobe Acrobat will not allow admin access to the file at all if the user and owner password match or if the user password is set and the owner password is empty because they only attempt to validate the owner password if the supplied password doesn't work as the user password. That would explain the behavior you are seeing. Some packages, including qpdf, will try to see if the owner password might be empty even when the user password is not empty, and even though this doesn't really make much sense. Newer encryption formats encrypt the actual key independently with both the user password and the owner password, and as such, it is not possible to retrieve the user password with the owner password.īecause of this behavior, some applications will try to open an encrypted password trying the empty string as the user password, and if that fails, they will prompt for a password. If so, they can retrieve the user password, and from there, they can retrieve the key. If not, they check to see if it's the owner password. If so, they can retrieve the key and decrypt the file.
PDFINFO MARRKET PDF
PDF viewers would first try to see if the supplied password is the user password. In older PDF encryption formats, the file was encrypted by an encryption key that is derived from the user password, and the user password is actually stored in the file encrypted with the owner password.
As such, it doesn't make sense to provide a user password and not an owner password, as this would mean that not providing a password is more restrictive than providing a password.
PDFINFO MARRKET FULL
Note that qpdf disregards the file's security in all cases and treats the user and owner passwords the same.Ĭompliant PDF viewers are supposed to honor the file's security when the file is opened with the user password and allow full "admin" rights to the file when the file is opened with the owner password. Opening with the owner password will allow you to modify security in a tool like Adobe Acrobat. If you do this, people will be able to open the file without supplying a password, but compliant viewers will still enforce the document's security. Punchline: most likely what you actually want to do is to use the empty string for the user password and a non-empty string for the owner password, not the other way around. #PDFINFO MARKET K601 SERVICE MANUAL PASSWORD#
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