PATENTS

Additional IP Rights Grant (Patents)

"This implementation" means the copyrightable works distributed by
the polymer_elements.dart authors as part of the polymer_elements.dart project.

The polymer_elements.dart authors hereby grants to You a perpetual, worldwide,
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patent license to make, have made, use, offer to sell, sell, import,
transfer and otherwise run, modify and propagate the contents of this
implementation of polymer_elements.dart, where such license applies only to those
patent claims, both currently owned or controlled by the polymer_elements.dart 
authors and acquired in the future, licensable by the polymer_elements.dart 
authors that are necessarily infringed by this implementation of polymer-elements.  
This grant does not include claims that would be infringed only as a consequence 
of further modification of this implementation.  If you or your agent or 
exclusive licensee institute or order or agree to the institution of patent 
litigation against any entity (including a cross-claim or counterclaim in a
lawsuit) alleging that this implementation of polymer-elements or any code
incorporated within this implementation of polymer-elements constitutes
direct or contributory patent infringement, or inducement of patent
infringement, then any patent rights granted to you under this License
for this implementation of polymer-elements shall terminate as of the date
such litigation is filed.