There is a reason companies set limits on certain services. Any codes not publicly distributed are not distributed for a reason. Any holding of proprietary codes is illegal and may not be distributed.

P.S. the poster above you just mentioned that the code would lock you or block you... so it's not really serving a purpose for your need. There is a plan rolling out to give you unlimited DC for a flat fee per month... spend the extra bucks and avoid the legal hassle.