Group based restrictions is a new feature that was added at version 8 of PaperCut that provides a feature for administrators to restrict printer access to a group or groups of users.
Group based restrictions can be put on printers under Printers → [Name of the printer] → Filters and Restrictions.
This feature is useful in the following situations:
The Mac Operating system does not support group based printer permissions as standard. This feature in PaperCut provides a way to put group based restrictions on printers.
Windows does provide group based permissions as standard, however the message received by the users accessing restricted printers is ambiguous. Using the feature from PaperCut administrators can provide a customizable denied message when their printing fails because of group restrictions. Notification message can be modified from Printers → Notification Options
To learn more about groups read this chapter of PaperCut NG Manual.