The main reason why Debian/Ubuntu does not enable automatic use of network printers broadcasted by remote CUPS servers by default is that there is no way to tell apart locally configured (and thus trusted) printers from those which got advertized by remote CUPS servers (and thus open the possibility of luring someone into printing confidential material onto a rogue network printer).
E. g. I have a locally configured "local_ps" printer, and an ML-1610 configured on a remote server which appears through cups browsing detection. The print dialog currently looks like this:
the printers look exactly the same, I have no way to tell which ones can be considered trusted. It would be great to separate the locally configured from the remotely detected ones:
|_| Print to file |
Locally configured printers:
|=| HP DeskJet 123 | room 10 |
|=| Samsung Foo Color | |
Automatically detected remote printers:
|=| ML-1610 | dagobert |
Locally configured and automatically discovered remote printers can be told apart with the CUPS_PRINTER_DISCOVERED flag (see cups/cups.h).
<https://wiki.ubuntu.com/Printing#listing>: "whenever available printers are listed, they should be listed in up to two sections: * Whenever at least one manually configured printer is available, a section beginning with an insensitive item, “Configured printers”. * Whenever at least one broadcast printer is available, a section beginning with an insensitive item, “Discovered printers”."