Where can I find the product key on a preinstalled version of Windows 8?

1. Go to http://rweverything.com/download/ and download RW-EVERYTHING.

2. Run it.

3. Click on the ACPI Table button at the top. After that click on the MSDM tab. Your BIOS's product key is at the bottom like the following:

Reference: http://forums.lenovo.com/t5/Windows-8/Where-can-I-find-the-product-key-on-a-preinstalled-version-of/td-p/931681/page/2

Where can I find the product key on a preinstalled version of Windows 8?