Content reproducing apparatus and program of the same

A content reproducing method including:

• an acquisition step that acquires a first cipher key with an expiration from a server;
• a reproduction step that reproduces a content, using the first cipher key;
• and
• a determination step that determines whether or not a plurality of contents can be continuously reproduced using the first cipher key, when the reproduction step continuously reproduces the plurality of contents,
• wherein when it is determined that the plurality of contents cannot be continuously reproduced using the first cipher key because the first cipher key will expire during the continuous reproduction of the plurality of contents, the acquisition step newly acquires a second cipher key from the server prior to the start of the continuous reproduction, even if the first cipher key is not yet expired, and then the reproduction step continuously reproduces the plurality of contents, using the second cipher key, and
• when it is determined that the plurality of contents can be continuously reproduced using the first cipher key, the acquisition step does not acquire the second cipher key from the server, and the reproduction step continuously reproduces the plurality of contents using the first cipher key.

A computer program stored on a non-transitory computer-readable medium causing a computer in a content reproducing apparatus to perform:

• an acquisition step that acquires a first cipher key with an expiration date from a server;
• a reproduction step that reproduces a content, using the first cipher key;
• and
• a determination step that determines whether or not a plurality of contents can be continuously reproduced, using the first cipher key, when the reproduction step continuously reproduces the plurality of contents,
• wherein when it is determined that the plurality of contents cannot be continuously reproduced using the first cipher key because the first cipher key will expire during the continuous reproduction of the plurality of contents, the acquisition step newly acquires a second cipher key from the server prior to the start of the continuous reproduction, even if the first cipher key is not yet expired, and then the reproduction step continuously reproduces the plurality of contents, using the second cipher key, and
• when it is determined that the plurality of contents can be continuously reproduced, using the first cipher key, the acquisition step does not acquire the second cipher key from the server, and the reproduction step continuously reproduces the plurality of contents, using the first cipher key.