The San Francisco 49ers travel this weekend to face the Houston Texans in their preseason opener. The game kicks off at 5 p.m. PT, and will primarily be broadcast locally on KPIX, which is the Bay Area's CBS station. None of the 49ers preseason games will be broadcast nationally, but there is a legal streaming option at your disposal.
I have good news and bad news about watching 49ers preseason games online this year. In the past, the NFL offered something called Preseason Live. For $20, you could watch every preseason game live, except those broadcast nationally, and I believe if you live in the local broadcast market.