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.
(..) but she knows how to present herself. A pretty assistant is the most effective form of misdirection. Thank you. Ladies and gentlemen, for my final trick, I will require the assistance of two volunteers. Mr. Merrit, if you would oblige me? Yep. - Under? - Under, yeah. (..)2006 The Prestige