You don't say which software program you have, but most prohibit any transferring of licenses (keys) that you have purchased for your use. If the new owner wants to use that same program, he needs to purchase a license for himself in his own name.
You may be thinking of the paid upgrades for DMR, NXDN for Uniden scanners. Those paid upgrades are keyed to a specific scanner and will always stay in that one scanner.
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Just as an FYI, this is the license terms from Butel Software as mentioned above:
PSR-500 PSR-600 PRO-106 PRO-197 Software - ARC500 - Software series for the GRECOM GRE PSR-500 PSR-600 PRO-106 PRO-197 Digital Trunking Scanners License info: All prices shown are for a SINGLE user license and non professional users. You may install and use the software license codes on two different PC's as long as the owner of the license is also operating the computer.