Pre-Grant Publication Number: 20070136608
Filing Date: December 06, 2020
Inventors: Darko Kirovski, Kamal Jain
Assignee: Microsoft Corporation
Current U.S. Classification: 713, 713/193000
View Prior Art for Claim 00006
The method as recited in Claim 1, wherein prior to the off-line transaction the first and second media playback devices:
authenticate each other by exchanging certificates;
create a session key;
establish a data encryption and a data compression capability; and
establish a session identifier.
Patent/Application # 6915425
The prior art describes a system for controlling access to digital content after it has been downloaded to the user terminal. It covers the parts of the application that concern encryption, DRM and its management.
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Patent/Application # 6282653
This prior art covers most or all the aspects of the application that concern royalty payment. Also, the methods described are immediately and obviously applicable to "offline" transactions in the definition of the application. (The first and second devices in fact form a network between each other for the duration of each communication transfer, so "offline" is with respect to the parts of the described method that are not the two devices, making the distinction irrelevant in this comparison.)
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