"The activation technology uses a robust and proven algorithm to safely write its license data to an unused sector of the hard drive located in track zero."

Yeah, right. So any multiboot manager is instantly at risk to be corrupted. And at a guess, nothing short of writing zeros to the HD will get rid of it.

Furthermore:

"In addition, a Hardware ID and Activation ID are created. The Hardware ID is a mathematically computed one-way hash based on your computer's hard drive geometry and CPU family..."

Everyone remember the fun with XP's activation, where you got 10 changed-hardware points before you had to reactivate, but a reformat was three, a new NIC was three, and sometimes it just plain lost count?