Supreme Court has directed Prasar Bharati, parent body of DD, not to share the live content recieved under sports act with private broadcasters. And Yes
DD is supposed yo block the feed from its own side, which it seems, DD hasn't done yet, so private operators, in order to avoid any controversy, block it from their side.
Edit: The Court hasn't prohibited, in fact the clause saying that the signals are only for DD's own DTH and Terrestrial networks was there since the inception of sports act. All these years DD misused the fact that DD National is a must carry channel, by carrying shared broadcasts on it, the court just reminded that it shouldn't happen anymore
Prasar Bharati Cannot Re-Transmit Live Sporting Events To Pvt Cable Operators , Says SC [Read Judgment] | Live Law