Ryan Calo, a University of Washington law professor, said private property owners may adopt a “Pokemon No Go” policy and bar players from physically entering their building or grounds. But he said there’s no legal right to compel the game’s creators to remove a location from its lines of code.
“It’s important to note that the Pokemon are not there on the property,” he said. “What’s happening is that a particular location triggers the display of a digital monster on your phone. The monster is only on your phone.”
-Ryan Nakashima and Mae Anderson ‘Property owners: Get off my lawn, Pokemon!‘ The Associated Press