Well I couldn't locate any such document for OEM license, here's something on volume licensing you may found useful:
Where to get the information of all the Windows activation key type?
Is there any documentation on the difference between activation key types? For example, how each type of activation key is obtained, the number of activations available, and how they are licensed.
For example, the difference between OEM:nonslp, OEM:slp, and OEM:dm and how to obtain them, and whether OEM:dm supports all versions of Windows, such as Enterprise or Professional Workstation, etc.