Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
This is just a publicity stunt. Most people would have bought these DVD's years ago, so how many people are going to be able to prove the DVD purchase?
It will be useful for salespeople who are trying to sell BD players.
Customer : It looks good, but I dont want to replace all my DVD's again
Salesperson : You can get $10 back on DVD movies you replace with BD.
( SP Fails to mention the terms )
Customer : sounds good - give me that BD player!
To be fair the article says you just need to provide the UPC from the original DVD. So as long as you still have the box then you should be good to go.