Hello Michael,
If you have an invoice or any valid purchase proof with the price, date and your name on it, which you received when buying the DDJ-RZ, please file an inquiry from the link below.
https://rekordbox.com/en/support/inquiry.php
Thanks,
CRM, Pioneer DJ
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Did you lose yours? Was it previously activated?
no I thinking of getting ddj rz it used at good price but does not come with licences key
when are you going to come out with controller like ddj rzx and ddj 100 for serarto and when are you going to come out with ddj sz 3 rz 2 rzx 2 rr2 rx2 sr3
Controllers are not necessarily sold with a key if they're used - that's up to the owner, as they could keep it for use with other products (eg. CDJ-2000) which do not ship with a license.
If you're buying a used product without a license, you'll have to purchase one (or a subscription) at rekordbox.com.
To answer your "when" question, we've got an article for that.