Here's a concise, valuable rewrite focusing on the key information:

Fernando Sosa, a 3D printing artist, received a cease and desist letter from Katy Perry's lawyers regarding his sale of Left Shark figures inspired by Perry's Super Bowl halftime show performance.

Sosa responded through his legal counsel with a detailed letter challenging Perry's copyright claims. The response argues that costumes generally cannot be copyrighted under U.S. law, citing relevant legal precedents and requesting proof of Perry's claimed intellectual property rights.

The case has sparked debate about copyright law's application to costumes and 3D printed merchandise. Despite the cease and desist, Sosa continues selling the figures on Etsy while the legal dispute remains ongoing.

Update: Perry's legal team is now reportedly using photos of Sosa's 3D printed shark in their trademark application, further complicating the case.

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