Authentic server, user terminal, content server, control method for these, and computer program

A user terminal that plays a content stream provided from a content server, the user terminal comprising:

• at least one processor;
• and
• at least one memory that stores computer program code that, when executed by the at least one processor, causes the at least one processor to:
• transmit, to an authentication server, an authentication request by the user terminal to play content designated by a first user of the user terminal from among content that can be streamed from the content server;
• receive a first token from the authentication server, the first token being issued in response to the authentication request being received and permitting the user terminal to play the designated content;
• transmit a streaming start request of the designated content to the content server, the streaming start request including the first token;
• receive the designated content, the designated content being transmitted by the content server to the user terminal in response to the content server receiving the streaming start request;
• play the designated content received from the content server;
• when a predetermined duration has passed from reception of the content designated by the first user, which is prior to expiration of the first token, transmit, to the authentication server, a token reissue request that requests reissue of the first token;
• receive a second token that is issued by the authentication server, the second token permitting the user terminal to resume playing the same content as the designated content authenticated by the first token;
• and
• after streaming of the designated content authenticated the first token is interrupted because communications between the user terminal and the content server are disconnected or deteriorated, transmit, to the content server, a streaming restart request for resuming play of the designated content authenticated by the first token, the streaming restart request including the second token, wherein
• based on receiving a token reissue request by the first user for reissuing the first token prior to expiration of the first token, the authentication server transmits a streaming status confirmation enquiry to the content server, the streaming status confirmation enquiry asking whether the user terminal that the first user is using is continuing to stream the content designated by the first user,
• based on receiving, from the content server, a response to the transmitted streaming status confirmation enquiry that indicates that the user terminal that the first user is using is continuing to stream the content designated by the first user, the content server generates a second token that is for resuming the same content as the content authenticated by the first token,
• the content server transmits, to the authentication server, the second token to request verification of the second token, and resumes streaming of the same content authenticated by the first token to the first user terminal without waiting to receive a verification result of the second token from the authentication server,
• the authentication server verifies the second token, and
• the content server stops the content streaming having been resumed, if the verification of the second token by the authentication server fails.

A content server that provides content to a user terminal, the user terminal playing a stream of the content, and the content server comprising:

• at least one processor;
• and
• at least one memory that stores computer program code that, when executed by the at least one processor, causes the at least one processor to:
• store data of a plurality of pieces of content;
• receive, from a first user terminal that a first user is using, a streaming start request for streaming content designated by the first user from among the plurality of pieces of content, the streaming start request including a first token that indicates that the first user is authenticated for streaming of the content designated by the first user;
• transmit the first token to an authentication server to request verification of the first token;
• if the verification of the first token by the authentication server succeeds, stream data of the designated content to the first user terminal;
• and
• after streaming of the designated content authenticated by the first token by the first user terminal is interrupted because communication between the first user terminal and the content server are disconnected or deteriorated, and a streaming restart request for resuming play of the same content as the designated content authenticated by the first token is received from the first user terminal, transmit the second token to the authentication server to request verification of the second token and resume streaming of the same content authenticated by the first token to the first user terminal without waiting to receive a verification result of a second token from the authentication server, the second token being included in the streaming restart request, and the second token indicating that the first user is authenticated for streaming of the designated content authenticated by the first token;
• and
• stop the content streaming having been resumed, if the verification of the second token by the authentication server fails, wherein
• based on a token reissue request by the first user for reissuing the first token prior to expiration of the first token, the authentication server transmits a streaming status confirmation enquiry to the content server, the streaming status confirmation enquiry asking whether the user terminal that the first user is using is continuing to stream the content designated by the first user, and
• based on receiving, from the content server, a response to the transmitted streaming status confirmation enquiry that indicates that the user terminal that the first user is using is continuing to stream the content designated by the first user, the content server generated a second token that is for resuming the same content as the content authenticated by the first token.

A content streaming method comprising:

• transmitting, by a first user terminal to an authentication server, an authentication request for streaming of content designated by a first user;
• authenticating, by the authentication server, the first user, including comparing information included in the authentication request with registration information of the first user in registration information of a plurality of users;
• if the authentication succeeds, generating, by the authentication server, a first token indicating that the first user is an authenticated user for the content designated by the first user, and transmitting, by the authentication server, to the first user terminal, the first token;
• transmitting, by the first user terminal to a content server, a streaming start request for streaming the content designated by the first user, the streaming start request including the first token;
• transmitting, by the content server to the authentication server, the first token included in the streaming start request to request verification of the first token;
• verifying, by the authentication server, the first token;
• if the verification of the first token by the authentication server succeeds, causing, by the content server, the content designated by the first user to be streamed to the first user terminal;
• when a predetermined duration has passed from reception of the content designated by the first user, transmitting, by the first user terminal to the authentication server, prior to expiration of the first token, a token reissue request for reissuing the first token;
• based on receiving the token reissue request for reissuing the first token prior to expiration of the first token, transmitting, by the authentication server to the content server, a streaming status confirmation enquiry to the content server, the streaming status confirmation enquiry asking whether the first user terminal that the first user is using is continuing to stream the content designated by the first user;
• based on receiving, from the content server, a response to the transmitted streaming status confirmation enquiry that indicates that the first user terminal is continuing to stream the content designated by the first user, generating, by the authentication server, a second token and transmitting the second token to the first user terminal, the second token permitting the first user terminal to resume playing the same content as the content authenticated by the first token;
• receiving, by the first user terminal, the generated second token;
• after streaming of the designated content authenticated by the first token is interrupted because communication between the first user terminal and the content server are disconnected or deteriorated, transmitting, by the first user terminal to the content server, a streaming restart request for resuming play of the designated content authenticated by the first token, the streaming restart request including the second token;
• resuming, by the content server, streaming of the same content authenticated by the first token to the first user terminal without waiting to receive a verification result of the second token from the authentication server;
• and
• stopping, by the content server, the content streaming having been resumed, if the verification of the second token by the authentication server fails, wherein the content streaming method further comprises transmitting, by the content server to the authentication server, the second token to request verification of the second token and verifying, by the authentication server, the second token.