Recently DD announced they are going to launch CA system in thier DTH Platform ( DD Direct Plus DTH). For DVB-T -2 Service very soon will be install new transmitters in all over country. By this service Mobile consumer can also watch these channels without any subscription. Although it is not confirmed that in DVB-T-2 service also included CAS system.
What is DVB-T Service ?
DVB-T is an abbreviation for "Digital Video Broadcasting — Terrestrial". Doordarshan National Channel already running by this service from long time. For receive signals you need a simple Antenna. In villages area 85% peoples using DVB-T technology already.
How to Signal Transmits :
In this technology signals data carrier by RF ( Radio Frequency) channel. VB-T offers three different modulation schemes (QPSK, 16QAM, 64QAM).
News Source: http://paper.hindustantimes.com/epaper/viewer.aspx