The National Broadcasting and Telecommunications Commission (NBTC) has imposed a regulation to classify Internet TV boxes as controlled equipment.
The regulation requires producers and importers of Internet TV boxes, such as Media Box, Android Box, Apple TV Box, TV Stick, HDMI Dongle, and Chromecast to apply for permission from the NBTC in accordance with Section 70 of the NBTC Act B.E.2008.
Penalties for those who produce, import or sell unauthorized Internet TV boxes include a maximum of two years in jail and/or a maximum fine of two million baht.
Source: http://news.thaivisa.com/article/2669/nbtc-controls-internet-tv-boxes