| 摘要 |
The invention relates to a device for carrying out the copy-protected distribution of electronic documents of a predetermined document data structure in a publicly accessible electronic data network, particularly the Internet. Said device comprises: a number of subscriber terminal units (10), which are at least occasionally connected to the electronic data network, are each assigned to a user, are configured for carrying out a loading access to an electronic document from a subscriber terminal unit or server unit (10') connected to the data network, and which are configured for opening the electronic document by means of a display unit provided on the side of the user. The subscriber terminal units for respectively accessing the electronic document over the publicly accessible electronic data network are configured in such a manner that a number of loading accesses are carried out on a number of associated electronic file sections from which at least one loading access ensues from another subscriber terminal unit (10, 10') assigned to another user. In order to carry out the number of loading accesses, the subscriber terminal units obtain electronic operational sequence instruction data, which are created in a document-specific and/or subscriber-specific manner, from an instruction data unit (24), particularly an instruction data server unit, connected to the electronic data network. The number of electronic file sections, which exist on the side of the user due to the loading accesses and which belong to the electronic document, represent a form of the electronic document, which is encrypted by an arrangement of file sections stipulated by the action of the operational sequence instruction data, and which cannot be used by the user in the manner provided. A reconstruction unit (30), particularly a reconstruction server unit, is connected to the electronic data network and is configured for storing a number of reconstruction files assigned to an electronic document in the encrypted form. In addition, the subscriber terminal units each have a local decrypting unit (16, 18) that, for each electronic document, is configured for an at least one-time access to the reconstruction unit via the electronic data network and configured for combining the encrypted form with a reconstruction file in order to generate the electronic document for display by the display unit in an unencrypted form that can be used by the user. |
