Companies would gain legal protection for sharing cyberthreats with each other and the government.

Companies would gain legal protection for sharing cyberthreats with each other and the government.

Lack of financial incentives to help pay for security upgrades may discourage businesses from participating.

Lack of financial incentives to help pay for security upgrades may discourage businesses from participating.

Security company Mandiant says it's not clear whether Iran group is government-backed.

Erroneous AP tweet about White House explosions sent stocks tumbling.

Erroneous AP tweet about White House explosions sent stocks tumbling.

Companies cite limited losses, while government says billions of dollars worth of corporate secrets stolen.