Other forms: enforcedly
Things that are enforced are required — someone makes you do them. The enforced rules at your school are the ones that the teachers make sure all students stick to and follow.
One way to remember that enforced means "required" or "compelled" is to think of rules being "in force." It's almost always laws, rules, or standards that are enforced — enforced parking regulations, for example, are rules that will earn you a ticket if you don't follow them. The adjective enforced comes from the verb enforce, which originally meant "strive or attempt," and later "compel" or "exert force." The Old French root is enforcier, "strengthen," and also "oppress."