PRF file extension - PICS rules file
What is prf file? How to open prf files?
File type specification:
The prf file extension is also related to so called PICS rules. The PICSTM specification enables labels (metadata) to be associated with Internet content. It was originally designed to help parents and teachers control what children access on the Internet, but it also facilitates other uses for labels, including code signing and privacy.
The PICS platform is one on which other rating services and filtering software have been built.