Patent ID: 7672905

Claim:
An apparatus for rendering a digital content having license information, comprising: a license processor that acquires a constraint from the license information defining specifics of permission of a rendering operation of the digital content, the constraint defining conditions between rendering of the digital content designated for rendering and rendering of a constraint content other than the digital content designated for rendering; an operation execution command generator that generates an operation execution command for rendering the digital content designed for rendering and the constraint content according to the constraint acquired by the license processor; and a content renderer that renders the digital content designated for rendering and the constraint content based on the operation execution command generated by the operation execution command generator, wherein the license processor acquires, as a constraint, a time constraint indicating a chronological relationship between the digital content and the constraint content, the chronological relationship being selected from a group including at least a relationship indicating the digital content is rendered before the constraint content, a relationship indicating the digital content is rendered after the constraint content, and a relationship indicating the digital content is rendered simultaneously with the constraint content, and the operation execution command generator generates an operation execution command for rendering the digital content and the constraint content according to the chronological relationship defined in the time constraint acquired by the license processor.