Patent ID: 7765601

Claim:
An information processing system, comprising: a first information processing device; and a second information processing device operable to communicate with said first information processing device through a network; said first information processing device having, a license information-sending unit that sends license information containing utilizing-time limit information for utilizing a content in response to a request from said second information processing device; and said second information processing device having, a license information-receiving unit that receives the license information sent by said license information-sending unit, an interface that acquires time information through the network, an internal clock-setting unit that refers to the time information acquired by said interface to set time information of a built-in internal clock, and a microprocessor configured to control a utilization of the content, which the license information received by said license information-receiving unit targets, based on the time information of said built-in internal clock set by said internal clock-setting unit or time information of a counter working independently of said built-in internal clock; a flag-checking unit configured to receive, from said first information processing device, a contents playback-authorizing flag showing whether the utilization of the content is available when the utilization of the content is directed, said microprocessor exercising a control to forbid the utilization of the content wherein when the contents playback-authorizing flag shows that the utilization of the content is not available; a time judging unit configured to judge whether the time information of said built-in internal clock is faster than the time information of said counter; and a counter-setting unit configured to set the time information of said counter to coincide with the time information of said built-in internal clock when said time-judging unit judges that the time information of said built-in internal clock is faster than the time information of said counter.