Yeah sry. I searched abt it came to know that...
There is no longer a CAO sticker on a PC that comes with pre-installed Windows .the only proof on that system is by running the slmgr.vbs /dlv command. On the second line of the resulting dialog under Description they can see that OEM licence, which proves that is embedded in the system BIOS
Other than that the manufacturer/retailer is the only other source to prove an OEM licence . . .
Thank You
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