Netflix Throttling

[Alex]

I'm pretty sure I know the barcode window in the envelope and it doesn't have much (if anything) to do with disc returns (notice that no instructions are given on how to put the disc back in the envelope for return).

The window in the envelope allows process improvements for shipping. It used to be that the window wasn't there, so they had to work hard that the correct disc ended up in the envelope with your mailing label on it.

This way they can just put any disc into the next unlabelled envelope, seal it, and send it through their printer which will scan the visible barcode for the contained disc and then print the appropriate label.

They might be rescanning when the envelopes come back but if so they're not promoting it.