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ANDROID TRADEMARKS & LICENSING

Trademarks
In order to use the Android trademark, device manufacturers must ensure that the device complies with the Compatibility Definition Document (CDD) and then get permission from Google. Devices must also meet this definition to be eligible to license Google's closed-source applications, including the Android Market. Participation in the compatibility program is free of charge.
In September 2010, Skyhook Wireless filed a lawsuit against Google in which they alleged that Google had used the compatibility document to block Skyhook's mobile positioning service (XPS) from Motorola's Android mobile devices. In December 2010 a judge denied Skyhook's motion for preliminary injunction, saying that Google had not closed off the possibility of accepting a revised version of Skyhook's XPS service, and that Motorola had terminated their contract with Skyhook because Skyhook wanted to disable Google's location data collection functions on Motorola's devices, which would have violated Motorola's obligations to Google and its carriers.

Licensing

The source code for Android is available under free and open source software licenses. Google published their Linux kernel changes under the GNU General Public License version 2, and the rest of the code (including network and telephony stacks) under the Apache License version 2.0. Google also keeps the reviewed issues list publicly open for anyone to see and comment.
The Open Handset Alliance develops the GPL-licensed part of Android, that is their changes to the Linux kernel, in public, with source code publicly available at all times. The rest of Android is developed in private, with source code released publicly when a major new version is released. Typically Google collaborates with a hardware manufacturer to produce a flagship device (part of the Google Nexus series) featuring the new version of Android, then makes the source code available after that device has been released.
In early 2011, Google chose to temporarily withhold the Android source code to the tablet-only Honeycomb release, creating doubts over Google's commitment to open source with Android. The reason, according to Andy Rubin in an official Android blog post, was because Honeycomb was rushed for production of the Motorola Xoom, and they did not want third parties creating a "really bad user experience" by attempting to put onto smartphones a version of Android intended for tablets.The source code was once again made available in November 2011 with the release of Android 4.0.

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