As stated on the Mystery Solved page at Microsoft.
Some things will always be a mysteryIt appears that you can get a spiffy USB drive FREE to you, provided by Microsoft.
Windows licensing doesn't have to be.
The USB drive will come with FAQ's, Windows Licensing Guide, License brief, Production Information, Transfer of Volume license information and other resources.
From what I can tell, all you have to do is fill out the form, answer a few questions and wait for your USB drive.
The only catch I can see if that you have to give Microsoft your home address. hehe