From The Washington Post:

California law has a process for applying for a permit to carry a handgun for protection in public, with requirements for safety training, a background check, and so on. These requirements were not challenged. The statute also requires that the applicant have “good cause,” which was interpreted by San Diego County to mean that the applicant is faced with current specific threats. (Not all California counties have this narrow interpretation.) The Ninth Circuit, in a 2-1 opinion written by Judge O’Scannlain, ruled that Peruta was entitled to Summary Judgement, because the “good cause” provision violates the Second Amendment.

This could lead to other state laws that are similar being struck down.