What is the KEY mentioned in the back side of CDJ2000NXS2

i brought brand new two CDJ 2000 NXS2,

rite now i am using 30 days trail period for recordbox software,

i would like to know what is the 27 digit KEY provided in the back side of each products, which is with the serial number and MFD date of that product, does it can be used for record-box license key, if not please tell what it is?!!!