Abstract:
The present invention provides a system for realizing both the operation of archive and sharing of contents capable of maintaining a privacy policy of critical data. In order to realize the system, a disclosure condition to a data reference destination and a data conversion method of the file data are designated, and only the file data matching the disclosure condition is provided to the data reference destination by anonymizing the file data via the data conversion method. When the disclosure condition or the data conversion method is changed, an already disclosed file data is deleted, or replaced with the file data subjected to data conversion after the change.