card.io's Android SDK uses code (with gratitude!) from Willow Garage's OpenCV. The Android SDK is tested with Robotium.
Willow Garage's OpenCV, BSD license:
Actual license text not provided -- [the OpenCV website](http://opencv.willowgarage.com/wiki/) says "OpenCV is released under a BSD license, it is free for both academic and commercial use.", with links to http://opensource.org/licenses/bsd-license.php and http://en.wikipedia.org/wiki/BSD_licenses
Robotium's Apache license:
Actual license text not provided -- [the Robotium website](https://code.google.com/p/robotium/) links to http://www.apache.org/licenses/LICENSE-2.0