Microsoft Windows 10 OEM
- ultra-modern operating system for a wide range of devices: PCs, servers, TVs, tablets and smartphones. The advantage of this OS is that users of licensed Windows 7, 8 and 8.1 can upgrade the system to Windows 10 for free within the first year after its release. A computer with an OEM version installed is not allowed to be leased or temporarily used. The main distinguishing feature of OEM-versions
Is that they are "tied" to a computer that was originally installed and can not be transferred to a replacement computer or any other PC. The term "personal computer" means a fully assembled computer system comprising at least a central processing unit, a motherboard, a hard drive, a power supply and a housing. Required confirmation of the user's license rights
Is a certificate of authenticity glued to the PC case. For additional confirmation of license rights and accounting purposes, it is strongly recommended to save the packaging, information media (disks with a hologram, if they are included in the product) and documents confirming the purchase.
Unlike box products that have colorful packaging, OEM versions have technological packaging made of brown cardboard.
A more detailed description and information on Right to use earlier versions of products (Downgrade)
You can see here