Dropp-- with all due respect it IS a bond. It is prorated and if you leave before the end date you are expected to pay the remaining portion.
BOND -an agreement with legal force, in particular:
synonyms: promise, pledge, vow, avowal, oath, word, word of honour, solemn word, guarantee, assurance; agreement, understanding, engagement, commitment, obligation, contract, pact, transaction, bargain, deal, settlement, covenant, compact, treaty, concordat, accord;