rekordbox licence key

I recently purchased an xdi rx on eBay but haven't ended up with the licence key which was a big part in buying it, was wanting to know if there is any way you could let any one with an ddi or xdi of any kind getting the full version with proof of  owning the equipment. Its a shame we have to pay full whack when we've just forked out a lot for the hardware, thanks for reading folks.