Internal Program Version: cups-filters  1.28.15

Contains backends, filters, and other software that was once part of
the core CUPS distribution but is no longer maintained by Apple Inc.
In addition it contains additional filters and software developed 
independently of Apple, especially filters for the PDF-centric printing
workflow introduced by OpenPrinting and a daemon to browse broadcasts of
remote CUPS printers and makes these printers available locally.
Since Ghostscript version 9.10 the CUPS filters gstoraster and gstopxl
are removed from Ghostscript. Those filters are now provided by cups-filters.
Since cups-filters version 1.0.42 foomatic-rip is also provided by cups-filters.
Since CUPS greater or equal 1.6 the CUPS Browsing functionality is dropped in CUPS. 
The OpenPrinting cups-browsed is a daemon running in parallel to the CUPS daemon
to provide again basic CUPS Browsing functionality. This way basic CUPS Browsing 
works on clients with CUPS greater or equal 1.6 when there are remote CUPS servers
of CUPS version 1.5 and older in the network. Load-balancing (what CUPS 
greater or equal 1.5 did via implicit classes) is not supported with
cups-browsed.

https://wiki.linuxfoundation.org/openprinting/cups-filters