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You need something like:

<license>BSD</license>

in your package.xml.

Read more here:

http://wiki.ros.org/catkin/package.xml#Required_Tags
http://wiki.ros.org/DevelopersGuide#Licensing

ROS Answers is licensed under Creative Commons Attribution 3.0 Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.