DRM Protected Content Sharing

Abstract

A system and method for transmitting protected real-time content from one user to another is described. In a first aspect, a user sends a Rights Object to another user. In a second aspect, a user sends a Rights Object to another user via an intermediate server for a multiparty communication. In this second aspect, the users may be able to switch between designated Rights Objects as needed.

1 . A method comprising:
 at a first device, receiving a plurality of rights objects, each rights object of the plurality of rights objects is associated with a user of a plurality of users, wherein:
 the plurality of users includes a first user and a second user, and 
 the plurality of rights objects includes a first rights object associated with the first user and a second rights object associated with the second user; 
   receiving first protected content and a notification identifying an associated user;   determining which user of the plurality of users is the associated user;   in response to determining that the first user is the associated user, decrypting the first protected content based on the first rights object; and   in response to determining that the second user is the associated user, decrypting the first protected content based on the second rights object.   
     
     
         2 . The method according to  claim 1 , wherein said notification is in a Contributing Source (CSRC) field of a real time protocol packet. 
     
     
         3 . The method according to  claim 1 , further comprising:
 transmitting a message including a third rights object associated with a third user;   wherein the message is a message to subscribe to a conference between the second user and the third user,   wherein the first rights object and the second rights object are included in a SIP NOTIFY message, and   wherein the SIP NOTIFY message is received in response to the third user joining the conference.   
     
     
         4 . The method of  claim 1 , further comprising:
 receiving information from a third user at the first device;   encrypting the information, resulting in second protected content;   generating a user rights object for the second protected content; and   transmitting the second protected content and user rights object.   
     
     
         5 . The method of  claim 1 , wherein the first protected content is protected real-time content. 
     
     
         6 . An apparatus comprising:
 at least one processor; and   at least one memory storing computer executable instructions that, with the at least one processor, cause the apparatus to:   receive a plurality of rights objects, each rights object of the plurality of rights objects is associated with a user of a plurality of users, wherein:
 the plurality of users includes a first user and a second user, and 
 the plurality of rights objects includes a first rights object associated with the first user and a second rights object associated with the second user; 
   receiving first protected content and a notification identifying an associated user;   determining which user of the plurality of users is the associated user;   in response to determining that the first user is the associated user, decrypting the first protected content based on the first rights object; and   in response to determining that the second user is the associated user, decrypting the first protected content based on the second rights object.   
     
     
         7 . The apparatus of  claim 6 , wherein the notification is in a Contributing Source (CSRC) field of a real time protocol packet. 
     
     
         8 . The apparatus of  claim 6 , wherein the at least one memory further stores computer executable instructions that, with the at least one processor, cause the apparatus to:
 transmit a message including a third rights object associated with a third user;   wherein the message is a message to subscribe to a conference between the first user and the second user,   wherein the first rights object and the second rights object are included in a SIP NOTIFY message, and   wherein the SIP NOTIFY message is received in response to the third user joining the conference.   
     
     
         9 . The apparatus of  claim 6 , wherein the at least one memory further stores computer executable instructions that, with the at least one processor, cause the apparatus to:
 receive information from a third user at the first device;   encrypt the information, resulting in second protected content;   generate a user rights object for the second protected content; and   transmit the second protected content and user rights object.   
     
     
         10 . The apparatus of  claim 6 , wherein the first protected content is protected real-time content. 
     
     
         11 . One or more computer readable media storing computer executable instructions that, when executed, cause a processor to:
 receive a plurality of rights objects, each rights object of the plurality of rights objects is associated with a user of a plurality of users, wherein:
 the plurality of users includes a first user and a second user, and 
 the plurality of rights objects includes a first rights object associated with the first user and a second rights object associated with the second user; 
   receiving first protected content and a notification identifying an associated user;   determining which user of the plurality of users is the associated user;   in response to determining that the first user is the associated user, decrypting the first protected content based on the first rights object; and   in response to determining that the second user is the associated user, decrypting the first protected content based on the second rights object.   
     
     
         12 . The one or more computer readable media of  claim 11 , wherein the notification is in a Contributing Source (CSRC) field of a real time protocol packet. 
     
     
         13 . The one or more computer readable media of  claim 11 , further storing computer executable instructions that, when executed, cause the processor to:
 transmit a message including a third rights object associated with a third user;   wherein the message is a message to subscribe to a conference between the first user and the second user,   wherein the first rights object and the second rights object are included in a SIP NOTIFY message, and   wherein the SIP NOTIFY message is received in response to the third user joining the conference.   
     
     
         14 . The one or more computer readable media of  claim 11 , further storing computer executable instructions that, when executed, cause the processor to:
 receive information from a third user at the first device;   encrypt the information, resulting in second protected content;   generate a user rights object for the second protected content; and   transmit the second protected content and user rights object.   
     
     
         15 . The one or more computer readable media of  claim 11 , wherein the first protected content is protected real-time content.