I presume all countries have a similar authority, certainly the UK does, although at this precise moment in time I've forgotten what it's called :lol:
It's obviously been too many years since I was a practicing radio amateur!.
Depending on the country, illegal use of an un-licenced radio transmitter can be a serious offence, from what I can remember of the UK law you can be given serious fines and even jail time, plus confiscation of all your gear!.
If you bought the toy car in your country, at a legal shop, I would think it does use a frequency (and power level) that is licence free.
The frequency spectrum licencing does differ from country to country, some may even forbid *any* unlicensed transmissions.
Try searching your government websites for ' radio communication frequency licensing' or maybe contact a local amateur radio operator who should be able to point you to the correct department for frequency spectrum allocations.
Klaus