Most copies are poor quality bootlegs. Number Seventeen, like all of Hitchcock's British films, is copyrighted worldwide. For more information, search for "Alfred Hitchcock: Dial C for Copyright".
Ben tells Barton that he would have been "Ben Bolt" if Barton had let him. He's referring to the title character in the Thomas Dunn English/Nelson Kneass song, Ben Bolt. He chooses that name, of course, because what he wanted to do was "bolt" from the house.