StakerLaw Tax and Estate Planning Law Corporation reported a data breach to the California Attorney General. The incident occurred on December 20, 2013. The firm notified clients on December 26, 2013. The specific nature of the breach, data types affected, and number of individuals impacted are not detailed in the provided summary page or attachment text, though the firm's name suggests potential exposure of tax and estate planning records (PII, financial, government IDs).