Patent ID: 8522053
Filing Date: 2013-08-27
Classification: G06F,H04L

Abstract:
1. An encrypted digital content playback device comprising: a program execution unit configured to execute a program while switching between a first mode indicating an operating state in a first security level and a second mode indicating an operating state in a second security level lower than the first security level; and an external device disconnection unit configured to disconnect an external device from the program execution unit when the program execution unit executes the program in the first mode, wherein a first secure program is executed in the first mode, a second secure program is different from the first secure program and is executed in the second mode, an application program is executed in the second mode, and starts the second secure program according to a digital content playback instruction from a user, the first secure program obtains a content key for decrypting encrypted digital content according to an instruction from the second secure program after the external device disconnection unit disconnects the external device from the program execution unit, a content playback program is executed in the second mode, and controls playback of digital content stored in a buffer, and the first secure program, the second secure program, the application program and the content playback program operate as a single encrypted digital content playback application in combination with one another.