Data management method and system thereof
AssigneeSony Corporation
InventorIsao Kawashima
Life of this patent
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Abstract
To enable management by a center of data transferred to a user terminal from the center, an ISDN, which has a call connecting means which forms a signal channel before forming a data channel between a user terminal and center and enable user to user transfer of data on that signal channel. In the control routine, control data regarding data management which prohibits or releases copying or reediting between a center and user is transferred between the center and user terminal. The data after transfer to the user terminal can also be managed from the center.
Claims22
A data management system in a data communication system comprising a control means which, when performing data communication between a first communication means and a second communication means, establishes a signal channel before establishing a data channel and transfers control data for data management between said first communication means and said second communication means through said signal channel before using said data channel to transfer managed data.
A data management method in a data communication system for performing data communication between a first communication means and a second communication means, comprising the steps of:
- forming a signal channel before formation of a data channel;
- via said signal channel, enabling transfer of managed data among said first communication means and said second communication means
- before said data channel is used to transfer data;
- and
- transferring control data regarding a data management by using said signal channel.
Dependencies are inferred from the claim text.