Not only 6 devices but you have to connect the device to Sony's Connect store to de-authorize it. My main computer's primary hard drive recently crashed. Sony sees the same computer with a new hard drive as a new device. However I can't use that device to "de-authorise" it because it no longer works. Sony says they de-authorized it but it still shows as one of my devices. Go figure! At this rate, we will all eventually have only our reader that is usable and also authorized.
