The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 2018
Filed:
Sep. 02, 2016
International Business Machines Corporation, Armonk, NY (US);
Akira Ohkado, Yokohama, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method, system, mediation server, client, and computer program for deleting a copied file in which a master file is duplicated while maintaining a certain level of security. A mediation server receives and stores a copied file in which a master file stored in a server is duplicated, generates private-key information and public-key information, and transmits the generated public-key information and the copied file to a client. The client receives and stores the copied file and the public-key information. In a case where the copied file is updated, the client encrypts difference information on the difference arising in the updating using the public-key information and transmits the difference information to the mediation server. The client determines whether the condition for being secure is satisfied when a process for updating the copied file becomes possible. When determining that the condition is not satisfied, the client deletes the copied file.