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.
(..) No. Something stinks. And this one-- You. In your $ suit... and that smug smile on your face. Dealing for that piece of shit. I don't like it. The law requires me to serve... my clients and their interests as best I can. We don't make deals here, Mr. Swarr. My client informs you that... (..)1995 Se7en