How can I use the software?Summary: For Windows 8, Microsoft has completely rewritten its license agreements, replacing legalese with plain language and for the first time allowing retail customers to legally install cheaper OEM versions. Here's what's new.
OEM
The software is licensed, not sold.Under this agreement, we grant you the right to install and run one copy only on the computer with which you acquired the software (the licensed computer)...
RETAIL UPGRADE
We do not sell our software or your copy of it – we only license it. Under our license, we grant you the right to install and run that one copy on one computer (the licensed computer), for use by one person at a time, but only if you comply with all the terms of this agreement. Typically, this means you can install one copy of the software on a personal computer and then you can use the software on that computer.
PERSONAL USE LICENSE (SYSTEM BUILDER) FOR WINDOWS 8 PRO
We do not sell our software or your copy of it – we only license it.Under our license, we grant you the right to install and run that one copy on one computer (the licensed computer) as the operating system on a computer that you build for your personal use, or as an additional operating system running on a local virtual machine or a separate partition, subject to the restrictions outlined under “Are there things I’m not allowed to do with the software?”
Full article at ZDNet