| 摘要 |
The invention relates to a method for distributing a digital document, to which a multiplatform exchangeable user right capable of being multiply copied is attached, to a system in which said method is implemented and to a digital document model suitable for such a system. The security of an EPUB book, or more generally of an HTML or XML document is ensured by a procedure that encrypts the pages, element by element, at the time of output (by 10A) when the document is downloaded onto a terminal (21). The document is then opened in a technology console for "navigational use beyond the navigator" (widget) (50). Reading begins by activating the initialization request (221) containing the single identifier of the document to the control server 10B, which returns an XML format opening ticket (231) containing the current rights. If the current rights do not allow reading, processing stops there. In the opposite case, the end of the loading of each XHTML page, picked up by the supervisor of the page, triggers the requests for decryption of said page. Said event sends the encrypted structuring elements (241) to the control server (10B), the server returning same decrypted (251), thus displaying the elements unscrambled in the navigator of the widget console. The multimedia contents and images, themselves encrypted, are encrypted by means of a specific key generated by the control server or are filtered by a transformation matrix. Due to an encrypted cache implemented within the console (25), the document can be restored, in partially disconnected mode, or permanently disconnected by being attached onto a terminal. The requests containing the encrypted elements (242) and (252) are then addressed to the cache on behalf of the control server. The areas Z1, Z2, Z3, and Z4 represent the content, the supervising agent, the single identifier, and the signature of a document displayed by the specialized console (50). |
