All wireless devices need licence from central government's wireless planning authority. Otherwise if someone who is adversely affected by the operation of your device lodges a complaint, action will be taken including confiscation of your device, hefty fine or even imprisonment.
Thank you for raising this concern. We do operate on unlicensed (free to use) sub 1 Ghz frequency. For the security we have our own protocol to take care of authenticity and integrity. Hence, it will not lead to any kind of problem as mentioned by you.
