Downgradation of windows 8 Pro to Windows 7 pro

How to downgrade Windows 8 Pro. to Windows 7 Pro. with OEM License ?
I don't have Product key of Windows 7 Pro. but I have the media of Windows 7 Pro.
Can I use the same product key of windows 7 Pro. suppose some is already using that key ?

So can I use pre licensed key that is already installed on another system ?
Will it not be violation of Product key into another system and in how many system I can installed the Product key ?
refer to: http://support.microsoft.com/kb/2832566 
Also, refer to:
http://www.microsoft.com/en-us/legal/IntellectualProperty/UseTerms/Default.aspx
e.g.:
Can I downgrade the software? Instead of using the Windows 8 Pro software, you may use one
of the following earlier versions: Windows 7 Professional or Windows Vista Business.
This agreement applies to your use of the earlier versions. If the earlier version includes different components, any terms for those components in the agreement that come with the earlier version apply to your use of such components. Neither the manufacturer
or installer, nor Microsoft, is obligated to supply earlier versions to you. You must obtain the earlier version separately. At any time, you may replace an earlier version with Windows 8 Pro.
Don
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