CUPS is the widely used printing system for UNIX-like operating systems that presents a modern, network-centric print stack built around IPP. It includes the scheduler (the print server), filters, backends, and PPD/driver plumbing needed to accept jobs, determine capabilities, rasterize or convert, and deliver output to devices over local and network transports. Its modular pipeline lets administrators and vendors plug in drivers or filter chains while retaining a consistent user-facing...