Commitment to enrollment question

<p>My son has been accepted to CMU as a transfer student. He was asked to send a non-refundable deposit together with a signed agreement to inform other colleges of his decision to enroll at CMU, and not to post an enrollment deposit to any institution other than CMU, by next week. He is waiting for results from other colleges before making his final decision, which unfortunately could delay till end of June. My question is what would be the consequences if he went ahead with posting the deposit and submitting enrollment agreement with CMU but decided to choose another college, other than the deposit is forfeited? Thanks for your help.</p>