Apple owns CUPS though, I highly suggest that you read the license terms[1] for it now: License Exceptions 1. (a) Software that is developed by any person or

Apple owns CUPS though, I highly suggest that you read the license terms[1] for it now: License Exceptions 1. (a) Software that is developed by any person or entity for an Apple Operating System ("Apple OS-Developed Software"), including but not limited to Apple and third party printer drivers, filters, and backends for an Apple Operating System, that is linked to the CUPS imaging library or based on any sample filters or backends provided with CUPS shall not be considered to be a derivative work or collective work based on the CUPS program and is exempt from the mandatory source code release clauses of the GNU GPL. [1] http://www.cups.org/documentation.php/doc-1.5/license.html http://www.cups.org/documentation.php/doc-1.5/license.html