Washington (CNN) -- The Supreme Court has struck down a California law that would have banned selling "violent" video games to children, a case balancing free speech rights with consumer protection.

The 7-2 ruling Monday is a victory for video game makers and sellers, who said the ban -- which had yet to go into effect -- would extend too far. They say the existing nationwide, industry-imposed, voluntary rating system is an adequate screen for parents to judge the appropriateness of computer game content.