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Make Code 128 in Software Figure 2.16 Windows media rights manager flow.

Figure 2.16 Windows media rights manager flow.
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Transfer to Portable Device Windows Media Player + Windows Digital Rights Manager
Package the Media
Publish Media
Streaming Media Server
Web Server
Request License
Rights Management is a five-stage process: packaging, distribution, establishing a license server, license acquisition, and playback (Figure 2.16). To package a file, the Rights Manager is used to encrypt it and lock it with a key. The key is stored in an encrypted license, which is distributed separately. Other information is added to the media file, such as the URL where the license can be acquired. The packaged digital media file is saved in Windows Media Format. To distribute the rights managed package, it can be placed on a Web site for download, placed on a media server for streaming, distributed on a CD, or e-mailed to consumers. Consumers are free to redistribute the rights managed package to their friends. In order for consumers to be able to unlock the rights managed packages, the content owner chooses a license clearinghouse to store the specific rights of the license and implements the Windows Media Rights Manager license services. That s all they need do to establish a license server. The role of the clearinghouse is to authenticate the consumer s request for a license. Because the media files and licenses are stored and distributed separately, it is easier to manage the entire system. To play a packaged media file, the consumer must acquire a license key to unlock the file. The process of acquiring a license begins automatically when the consumer attempts to acquire the protected content, acquires a pre-delivered license, or plays the file for the first time. Windows Media Rights Manager either sends the consumer to a registration page where information is requested or payment
The Medium
required, or silently retrieves a license from a clearinghouse. To play the digital media file, the consumer needs a media player that supports Windows Media Rights Manager. The consumer can then play the media file according to the rules or rights included in the license. Licenses can have different rights, such as start times and dates, duration, and counted accesses. For instance, default rights may allow the consumer to play the digital media file on a specific computer and copy the file to a portable device. Licenses are not, however, transferable. If a consumer sends a packaged digital media file to a friend, the person receiving the file must obtain his or her own license to play the file. This PC-by-PC licensing scheme ensures that packaged digital media files can only be played by the computer that has been granted the license key for that file. This scheme erodes consumer rights significantly. If you purchase a CD, the content owner grants you license to play that CD on any player you choose, provided you don t make public performances or illegal copies. Imagine the feeling of having purchased licenses to your entire music collection, exchanging personal data in the process, then having your PC stolen. How long would it take, in practice, to get all those licenses again on your replacement PC How would a consumer even prove that legitimate, fully paid up rights had been stolen or even keep an inventory (not on the now-missing PC) of the licenses owned and the conditions attached to each one What happens when a virus corrupts the hard drive on which the licenses granted are stored Will a bad block on your hard drive prevent you from accessing music you have paid to access If the licensing clearinghouse refuses to acknowledge your existing rights, so that the deal is effectively off, how will you get your personal data back from them On the one hand, streaming media makes it possible for people to save their precious time by bringing the music directly to them, but then wastes their time with the licensing issues. What the large print giveth, the fine print taketh away. How keys work is shown in Figure 2.17. To generate a key, the license key seed and key ID are needed. The license key seed is a value that is known only to the content owner and license clearinghouse. The content owner creates the key ID for each Windows Media file. This value is included in the packaged file. When the license clearinghouse needs to issue a license for a packaged file, a key can be recreated by retrieving the key ID for the packaged file. The Windows Media License Server uses the license key seed (which the clearinghouse provides) and the key ID from the packaged file to create the key. The key is included in the license sent to the consumer s computer. Using the key included in the
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