Shares in Grapevine-based GameStop (NYSE: GME) dropped 5 percent Thursday following news that Sony filed a patent application for technology that could limit the use of games to the original owner. The Associated Press has a detailed analysis of the issue here. The patent itself is also available online, and gaming and technology industry publications are filled with speculation about whether Sony would use this new technology to put a lid on the resale market or whether it is intended for a more…