CUPS-PDF 2.6.1 / 3.0 Beta 1 Description:
CUPS-PDF project is a PDF writer backend for CUPS. It is designed to produce PDF files in a heterogeneous network by providing a PDF printer on the central fileserver. It will convert files printed to its queue in CUPS to PDF and put them in a per-user-based directory structure. It can execute post-processing scripts, e.g. to allow mailing the results to the user. CUPS-PDF requires root privileges since it has to modify file ownerships. In recent distributions the "RunAsUser" option in cupsd.conf is set to "Yes" which removes these privileges. Please make sure to set "RunAsUser No" if you want to use CUPS-PDF.