Next: Decrypting a Document Up: Encryption and Decryption Previous: Introduction Contents Index

Encrypting a Document

To encrypt a document, the user and owner passwords must be given (here, fred and charles respectively):
$\begin{framed} \small\verb!cpdf -encrypt 40bit fred charles -no-print in.pdf -o... ...1.5mm} \small\verb!cpdf -encrypt AES fred '''' in.pdf -o out.pdf! \end{framed}$
In addition, the usual method can be used to give the existing owner password, if the document is already encrypted. A blank user password is permissible. In this event, PDF viewers will typically not prompt for a password for operations allowable with the user password.

When using AES encryption, the option is available not to encrypt the metadata. Add -no-encrypt-metadata to the command line.

root 2008-12-01