He was released 'on his own recognizance'. [=he promised to do what the court wanted him to do and the court let him go]
(..) Do you tell your landlord everything? Ah, I told you to be careful, Tom. If I'd have been careful piloting that recognizance plane during the war, you wouldn't have had the chance to take the pictures that won you a medal and a good job... and fame and money. (..)1954 Rear Window