Method For Managing A Time-Limited License On A Computer Application That Can Be Run On A Network Component

• US 20080010460A1
• Filed: 10/27/2005
• Published: 01/10/2008
• Est. Priority Date: 11/18/2004
• Status: Active Grant

• Current Assignee: RPX Corporation
• Original Assignee: Siemens AG
• Inventors: Schuschan, Martin
• Granted Patent: US 7,890,429 B2
• Time in Patent Office: Days
• US Class Current: 713/176
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]
• CPC Class Codes: G06F 21/51 at application loading time, e.g. accepting, rejecting, starting or inhibiting executable software based on integrity or source reliability

Abstract

In a method for managing a time-limited license on a computer application that can be run on a network component, a license data record is created that contains at least information concerning the computer application to be licensed, a license period and a signing time. The license data record is read from a license server, and based on the information concerning the signing time a reference date for this computer application is created. The reference date is compared with a system time, which is defined for the network component in order to determine a binding current time base for the license server. Based on this comparison, it is determined whether the computer application is run on the basis of at least one of the current time base and the granted license period. The reference date is continuously updated and stored on the license server.

Claims

1. A method for managing a time-limited license on a computer application that can be run on a network component, comprising:

a) creating a license data record that contains at least information concerning the computer application to be licensed, a license period and a signing time;

b) reading the license data record from a license server, and based on the information concerning the signing time determining a reference date for this computer application;

c) comparing the reference date with a system time, which is defined for the network component in order to determine a binding current time base for the license server;

d) based on this comparison, determining whether the computer application is run on the basis of at least one of the current time base and the granted license period; and

e) continuously updating the reference date and storing it on the license server.

2. The method of claim 1,

wherein

the license data record (also features a digital signature.

3. The method of claim 1,

further comprising

reading the license data record from the license server cyclically or on the basis of an event trigger.

4. The method of claim 2,

wherein

the signing time is only used to determine the reference date after a successful signature check.

5. The method of claim 1,

further comprising

equating the current time base for the license server with the system time, if the comparison of the system time with the previously determined reference date produces the result that the system time is more recent than or equal to the reference date.

6. The method of claim 1,

further comprising

using the reference date for a determination as to whether the license period has still not expired, as the current time base for the license server without adaptation to the system time, if the comparison of the system time with the previously determined reference date produces the result that the system time is older than the previously determined reference date.

7. The method of claim 1,

wherein

a counter is assigned to the network component for updating the reference dates, a counter status of said counter being added to the reference date continuously or discontinuously.

8. The method of claim 1,

wherein

the updated reference date is stored on the network component in a protected mode.