PDF Services is a free Snow Leopard service pack that installs the following service workflows in the Library > Services folder:

· PDF Encrypt File - This service will create an encrypted duplicate of the PDF files, selected in the Finder, using a single password provided by the user. The encrypted duplicates will be placed in the same directory as their source files, and will be named the same as their source file with “(encrypted)” appended to the end of their names. Scope: Available within Finder when PDF files are selected.
· PDF Set Metadata - This service will presents a window for entering PDF file information for the selected PDF files, including: Title, Author, Subject, Content Creator, and Keywords. Scope: Available within Finder when PDF files are selected. 

Tip: For quick access, assign a keystroke combinations for these services, in the Keyboard system preference pane of the System Preferences application.