The information and broadcasting (I&B) ministry on Wednesday has asked 164 private channels, which were given permission to uplink before December 2005, to register for downlinking in the country. Out of the 500-odd television channels, the I&B has issued notices to 164 such channels including Aaj Tak, Zee TV, NDTV 24x7, NDTV India, NDTV Profit, Sun TV, Sahara One, CNBC-TV 18 and India TV. At a...