You can limit the use of a printer to a subset of users on your computer or restrict access by systems on the network. For example, you might want to restrict access to a printer if it is reserved for printing sensitive information and only a subset of the people can print sensitive information or if using a high-quality printer incurs expenses that not all people are allowed to incur. To restrict use of the printer, the print service uses the lists of users and systems allowed or denied for a printer. If a user or system tries to use a restricted printer, the print service checks the list and refuses the request if access is not allowed.