New User Agent for HD quality

Hello, using the user agent provided with the code the HD streams are not extracted. Using this user agent (iPad) @"Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5355d Safari/8536.25" HD streams are extracted but for videos with crypted  sig an exception is raised. It is possible to make the decryption working also with iPad user agent?