Thank you for your post.
It's not possible to resell the license to some one else. This is listed as well in the End User License Agreement (EULA).
See here for the specific passage in the EULA:
Lifetime licenses cannot be sold or bartered in the future and if such actions are taken the license can be terminated at Company’s sole discretion
You can find the EULA under Computer--> C Drive--> Program Files--> NinjaTrader 7--> EULA
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