From the OC Register: 

SAN FRANCISCO – Female employees in California are poised to get new tools to challenge gender-based wage gaps and receive protection from discrimination and retaliation if they ask questions about how much other people earn.

A bill recently passed by the Legislature and that Gov. Jerry Brown has indicated he will sign won’t suddenly put all women’s salaries on par with men’s or prod employers to freely disclose what every employee makes, which could make it easier for workers to mount pay discrimination claims.

But the legislation expands what supporters call an outdated state equal pay law and goes further than federal law, placing the burden on the employer to prove a man’s higher pay is based on factors other than gender and allowing workers to sue if they are paid less than someone with a different job title who does “substantially similar” work.