The Digital TV Group

The DTG (Digital TV Group) is the association for British digital television broadcasters and annually publish and maintain the technical specifications for digital terrestrial television (DTT) in the United Kingdom, which is known as the D-Book[1] and is used by Freeview, Freeview HD, FreeSat and YouView. The association consists of over 120 UK and international members[2] who can participate in DTG activities to varying degrees, depending on their category of membership.