PC World shares a detailed FAQ related to this specific case

http://www.pcworld.com/article/3036102/legal/apple-versus-fbi-faq-explainer.html

At this writing, Apple’s battle with the FBI over how much it can and should help in the investigation of the San Bernardino shootings is less than a week old. But already it’s explosive to say the least. The government has accused Apple of being more concerned with marketing than the fight against terrorism, and Apple has drawn a line in the sand, saying that complying with the FBI’s request “would undermine the very freedoms and liberty our government is meant to protect.”

This fight isn’t going to be over anytime soon, so we’ll keep this FAQ updated as events unfold. If you have more questions—or want to respectfully debate the implications this case will have on privacy and security—please chime away in the comments and we’ll do our best to make everything about this confusing case as clear as possible.

Where does it stand right now? — The United States District Court for the Central District of California issued an order on February 16, giving Apple five business days to respond. Apple posted an open letter to customers on its website explaining its side of the case, prompting government attorneys to file a motion on February 19 disagreeing with Apple’s view of the situation, and asking the court to force Apple to comply.