rekordbox key

And I meant recordbox DJ. currently I can only use the 30 days test account

@Stefan Gutenmorgen : Sorry but for xdj rx there is no free license key for rekordbox dj performance mode. After the trial expire u should buy the license if u want to use performance mode.My xdj-rx didn't came with performance key license.

Dear DJ Hairless :) ... THX for your answer. Okay, I just found one key on the back of the RX. Try this out now.

https://rekordbox.com/en/news/DDJ-RZ_rekordbox_dvs/

If you are trying to enter a rekordbox serial number you obtained with the purchase of a CDJ, that number was valid for rekordbox 2.x and is not eligible to unlock rekordbox DJ (performance mode). You can download rekordbox DJ and use it in a trial mode for 30 days for free, after which you can subscribe to a monthly payment or purchase a license.

Be sure you enter the correct license key and include the dashes between the character sets as emailed / written on the info card. Beware a copy-and-paste from your email not working properly; try manually typing it in.

also see this https://forums.pioneerdj.com/hc/en-us/community/posts/203958803-unexpected-error

Just so you know the 'performance pack' is relatively new, and many djs still only use the 'free version' of rekordbox to analyse their tracks and use in systems like the XDJ RX. You have made a great purchase and I hope you enjoy it :)

THX for all your answers. Now I got it. So for the performance mode with XDJ RX the key  is not included.
Preparation of the tracks in the free EXPORT mode is always possible. 

Thank you guys for your help. I appreciate that!
See you. Stefan