/// <summary>
 /// Determines whether the card is locked and ifso returns by which user
 /// </summary>
 /// <param name="user">The user.</param>
 /// <returns>
 ///     <c>true</c> if the specified card is locked; otherwise, <c>false</c>.
 /// </returns>
 public bool IsLocked(out IUser user)
 {
     user = null;
     if (_cardHandler.Card != null)
     {
         ITvCardContext context = _cardHandler.Card.Context as ITvCardContext;
         context.IsLocked(out user);
         return(user != null);
     }
     return(false);
 }