Please note that replacing any of these components may render DRM-protected files unplayable at least temporarily. PC is usually identified by unique serial number of CPU, motherboard chipset, network card and other hardware components. This is accomplished by tying files to specific PC they were downloaded to. DRM system prevents users from making unauthorized copies of the multimedia files purchased in the online stores. This protection uses PlayForSure standard developed by Microsoft Corporation. DRM protection prevents unauthorized opening of WMV files. Some WMV files may have digital rights management (DRM) protection. Versions 7, 8, 9 and 9.1 are the ones most commonly used today. Several versions of this algorithm exist. These files contain video data compressed with either Microsoft's implementaion of MPEG-4 algorithm or proprietary Windows Media Video algorithm. WMV file extension is used by Windows Media Video files.
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