is a software for locking PDF files with a password in order to protect them against unauthorized access. It also works as a file unlocker.
Protecting PDF: PDFKey Pro
allows its user to password-protect PDF documents in order to prevent unauthorized viewing, copying or printing. It also offers the ability to restrict usage permissions to viewing or printing only.
Recovering documents: this tool also provides a feature for recovering documents in case of forgotten password. It is able to create an unlocked copy of a protected file so as the user can have the access to its contents.
Multiple files: PDFKey Pro
is able to deal with multiple files at a time. Of course, the user is free to lock or unlock files one by one but he can also process them in batch mode. This tool can work with an entire folder.
is easy to handle and is endowed with a sleek and intuitive interface.
It is compatible with both Windows and Mac platforms.
This shareware version is limited in terms of features and time of use.