I would like to clarify some confusion here. There is a distinction between the DVD SLEEVE and the ENVELOPE, which is the red mailer with your address on it. The mailer has no distinguishing marks and is not related to the DVD inside in any way. The only barcode on the mailer is for the addresses to and from.

The barcoded sleeve, on the other hand, identifies the disc inside, with a name, year, and short description. If the DVD goes in the wrong SLEEVE, chaos ensues. I know. I got the 1992 version of Last of the Mohicans inside the sleeve for the 1920 version. You have no idea the trouble I went through to explain the problem to Netflix. They sent me the same mis-sleeved disc three times, because they NEVER looked inside the sleeve!