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My back-of-the-envelope calculations suggest that Dolby gets at least 50 cents and as much as a dollar for every Windows PC sold.

The licensing schedule isn't public, but in its annual report for 2011 Dolby revealed that it collected $124 million in licensing fees from Microsoft for the year, with most of that revenue generated from Windows 7. This decoder, which is required for DVD movie playback, has to be licensed from Dolby Laboratories, Inc. Microsoft pays An OEM PC maker who licenses Windows from Microsoft must pay $2 in MPEG-2 licensing fees to enable DVD playback in every copy of Windows 7 Home Premium, Professional, and Ultimate. The maker of a cheap DVD player sold at Costco pays $2 per unit for the MPEG-2 rights. The pool itself is managed by MPEG LA, which collects and distributes royalties on behalf of the patent owners, under a master license agreement.

The licensing rights for the MPEG-2 standard are made up of a pool of patents contributed by their inventors.