The truck driver carries a special license, as the law 'requires' (him to do). = The truck driver carries a special license, 'as required by' law.
What will be 'required' of me if I accept the job? = What will I be 'required' to do if I accept the job?
The newspaper is 'required reading' [=reading that must be done] in my politics course.
(..) Because we can only do one. Send watney enough food to last till Or send back to get him right now. Both plans require the so we have to choose. But what about the crew? We'd be asking them to add (..)2015 The Martian