ZyXEL NSA325 User Guide - Page 516
License Exceptions, Apple Operating System Development License Exception
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For those not familiar with the GNU GPL, the license basically allows you to: Use the CUPS software at no charge. Distribute verbatim copies of the software in source or binary form. Sell verbatim copies of the software for a media fee, or sell support for the software. Distribute or sell printer drivers and filters that use CUPS so long as source code is made available under the GPL. What this license does not allow you to do is make changes or add features to CUPS and then sell a binary distribution without source code. You must provide source for any new drivers, changes, or additions to the software, and all code must be provided under the GPL or LGPL as appropriate. The only exceptions to this are the portions of the CUPS software covered by the Apple operating system license exceptions outlined later in this license agreement. The GNU LGPL relaxes the "link-to" restriction, allowing you to develop applications that use the CUPS API library under other licenses and/or conditions as appropriate for your application. License Exceptions In addition, as the copyright holder of CUPS, Easy Software Products grants the following special exceptions: 1. Apple Operating System Development License Exception; 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. You may therefore distribute linked combinations of the CUPS imaging library with Apple OS-Developed Software without releasing the source code of the Apple OS-Developed Software. You may also use sample filters and backends provided with CUPS to develop Apple OS-Developed Software without releasing the source code of the Apple OS-Developed Software.