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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.



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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.





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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.

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What the large print giveth, the fine print taketh away How keys work is shown in Figure 217 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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license, the player on the consumer s computer can open and play the protected file. The license also contains rules that govern the use of the digital media file; these are set by the content owner. Content owners can dictate how many times a file can be played, which devices a file can be played or transferred on, when the user can start playing the file and the expiration date of the license, if the file can be transferred to a CD burner or not, if the user can backup and restore the license, what security level is required on the client to play the file, and many other things. License management, for consumers, is a non-trivial task and certainly not invisible and seamless, unless they always default to the content owners interests and buy new licenses whenever they think they need them, whether or not they actually do. Licenses can be delivered in different ways and at different times, depending on the business model. The content owner might want licenses predelivered, or delivered after a consumer has downloaded and attempted to play a packaged file for the first time. Licenses can be delivered with or without the consumer s being aware of the process, using silent or non-silent license delivery. Content owners need to be very careful about how they exercise their rights. If they prefer the more Draconian options, they are implicitly giving the technology more opportunities to say to the consumer you are wrong, thus alienating paying customers. In a world where good

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