Microsoft於2009.5.19.取得一個根據使用者付費狀況，限制作業系統中特定功能存取的專利，能夠根據使用者購買的軟體版本，限制其使用某些功能。據Microsoft表示：所有版本的Windows 7都在同一張CD上，但不同版本有不一樣的產品金鑰，只能開啟該版本包含的功能。使用者若想升級到更高階的Windows 7，只需購買新的產品金鑰。
US7,536,726
Title:Restricted software and hardware usage on a computer
Filing Date:2005.11.3.
Issue Date:2009.5.19.
Abstract:
A client computer runs an operating system that executes additional applications by loading them using an application loader and executes device drivers for peripheral devices by loading the drivers using a device loader. The operating system restricts the functionality of the operating system, such as by making selected portions and functionality of the operating system unavailable to the user or by limiting the user's ability to add software applications or device drivers to the computer. Additionally, various techniques can be used to remove or reduce the functionality limitations of the computer.
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