tion, suitably modified by the business rules, then
tion, suitably modified by the business rules, then initiates the decryption of the content. The DRM client follows this typical sequence: 1. Send a request for the content and, if necessary, undertake a financial transaction. 2. If the client has credit, the commerce server transmits the authorization key. 3. The DRM client requests the business rules from the rights server and the media file from the content server. 4. The rights server forwards the business rules. 5. The content server streams the media. 6. The DRM client allows access to the media according to the business rules. The exact sequence varies from product to product. Note that the business rules can be downloaded each time and are separate from the content. This allows the content owner to change the rules at any time without having to reencrypt the media file. A movie initially might be available on a pay-per-view basis, then at a later date released for outright sale. The publisher may want to add or withdraw special offers. This division between the product and the promotional wrapper gives the retailer of virtual products greater freedom than the vendor of physical merchandise (where the offer could be printed on the packaging). It also allows pricing to be changed in real-time, much like the street vendor or an airline trying to fill empty seats at the last minute. The authorization can be issued in several ways. It could be from a subscriber management system (long used by pay TV) or it could be an e-commerce system. The rights management parties There are several parties in any content transaction. Each is looking for a different set of features in a DRM system. The final choice has to satisfy all parties if the commercial model is to be successful. Content creators/publishers Content can take many forms. The first focus was on music distribution, a consequence of the Napster debacle. The distribution of video content is very much tied to satisfactory security, much like the delayed release of the DVD. Live events are an area where pay-per-view could be applied. 270 The Technology of Video and Audio Streaming
Note: If you are looking for good and high quality web space to host and run your application check Lunarwebhost PHP Web Hosting services