Hello Ikki,
There are 2 types of registrations:
Annual subscription -> provide 12 months license files.
The license will contain expiration date according to the registration end date.
Permanent/perpetual -> no end date.
The license file is permanent. The registration end date will allow you or not to access the last license files.
A renewal support maintenance can be ordered
In case of annual subscription, the license file will expire.
If you renewal your annual subscription, the end date will change (add 12 months) and you need to re-generate the license files to get new license file with new end date.
For details, please have a look to FAQs:
Permanent vs Annual: Licensing and Registration FAQ|NXP
How to renewal annual subscription: Licensing and Registration FAQ|NXP
Have a great day,
Pascal
NXP Technical Support
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