CUPS 1.4 adds over ?? changes and new features to CUPS 1.3.x. This page provides a high-level outline of these changes. If you have never used CUPS before, read the "Overview of CUPS" document instead.

Commands

1. lppasswd; the lppasswd program is no longer installed setuid by default.
2. cupsfilter; the cupsfilter program now supports filtering of already-queued print job files.
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Web Interface

1. Look-n-feel; the web interface has been given a new look with a new CUPS logo.
2. Security; the web interface has been updated to require authentication for printing of test pages and RSS subscription operations.
3. Printer sharing; the "share printer" and "unshare printer" buttons are now only shown when printer sharing is enabled in the scheduler.
4. Printer configuration; improvements have been made to the add and modify printer pages.
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Networking

1. Bonjour (DNS-SD) printing support; a new mdns backend provides Bonjour-based printer discovery and the ipp, lpd, and socket backends now support Bonjour address resolution.
2. Bonjour (DNS-SD) perforance tuning; the scheduler now only uses a single file descriptor for printer sharing. It previously used one per printer.
3. Bonjour (DNS-SD) web interface registry; when remote access is enabled, the scheduler registers the web interface for easier access
4. SNMP-based monitoring; the ipp, lpd, and socket backends now report supply levels and printer status using SNMP queries.
5. SNMP port monitor MIB; the ipp, lpd, snmp, and socket now support the PWG port monitor MIB
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IPP Support

1. CUPS-Get-Document operation; the scheduler now supports a "get document" operation to download files from a print job.
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Scheduler

1. Performance tuning; the scheduler now coalesces configuration and state file changes to reduce the amount of disk activity.
2. Configuration files; the default cupsd.conf file now provides an "authenticated" policy for easy authenticated sharing of printers.
3. Seatbelt support; the scheduler now runs child processes using restrictive policies on Mac OS X for improved security and job isolation.
4. PAM support; the scheduler now sets more PAM attributes to better support third-party authentication schemes.
5. Test option; the scheduler now supports a test mode via the "-t" option.
6. Page logging; the scheduler now supports a PageLogFormat directive to control the format of the page_log file.
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Printer Drivers

1. Dynamic PPD support; drivers can now set PPD keywords dynamically using PPD: messages.
2. Generic PostScript command filter; a new CUPS command file filter for PostScript printers provides auto-configuration, self-test page, and status and supply level reporting functions.
3. PJL support; the cupsPJLDisplay PPD attribute controls the PJL commands used to display the current user and job on the printer.
4. Driver development kit; the CUPS DDK is now a standard part of CUPS
5. PPD compiler improvements; the PPD compiler now supports Mac OS X .strings files for localization and ...
6. Generic PostScript and PCL drivers; new generic PostScript and PCL drivers provide improved support for laser printers.
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Print Filters

1. Image filters; the standard image filters now support image files larger than 2GB.
2. Device discovery; the cups-deviced helper now runs backends in parallel for faster discovery and streams the results of discovery as the backends provide them.
3. PDF filter; the pdftops filter has been replaced with a wrapper program that runs the Xpdf, poppler, or Ghostscript PDF to PostScript utilities.
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CUPS API

1. Streaming API; a new streaming request API provides asynchronous job creation and request submission.
2. Device discovery; the new cupsGetDevices function streams discovered devices to an application-provided callback function.
3. PPD support; two new functions are provided, cupsGetPPD3 and ppdLocalizeMarkerName, to update the local copy of a printers's PPD file and get a localized marker (supply) name, respectively.
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