Method for managing recorded streams in a rewritable recording medium

Abstract

The present invention relates to a method for managing playlists of a rewritable recording medium in order to prevent unlimited playback or illegal edition of television broadcast programs or movies wherein copyright protection is required. The present invention operates by adding information needed for automatic timed deletion of consecutively recorded clips of A/V streams and deletion time information into the playlists of a recording medium such as a high density rewritable optical disc (BD-RW), whereby referring to the recorded information, the corresponding clips of A/V streams are automatically deleted.

1 . A method of managing digital content, comprising: 
 receiving a digital content, and a control information including a time information to restrict a playback of the digital content and a protection information preventing the digital content from modifying; and    managing the digital content according to the control information,    wherein the time information represents a time period capable of playback.    
   
   
       2 . The method of  claim 1 , wherein the managing step includes steps of analyzing the time information whether the time information indicates a relative time or an absolute time, the relative time being counted from the start of playback for the digital content, and the absolute time being counted from the receiving of the digital content, and 
 controlling the playback of the digital content as a result of analyzing step.    
   
   
       3 . The method of  claim 2 , wherein the analyzing step further includes a step of comparing the time information with a current time if the time is absolute time, and the controlling step controls the playback of digital content as a result of comparing step.  
   
   
       4 . The method of  claim 3 , wherein the controlling step comprises that the digital content can be played if a result of the comparing step indicates that there is time remaining in which access to the digital content is allowed.  
   
   
       5 . The method of  claim 3 , wherein the controlling step comprises that the digital content cannot be played if a result of the comparing step indicates that there is no time remaining in which access to the digital content is allowed.  
   
   
       6 . The method of  claim 2 , wherein the analyzing step further includes a step of comparing the time information with a counted time to access if the time is relative time, and the controlling step controls the playback of digital content as a result of comparing step.  
   
   
       7 . The method of  claim 1 , wherein the receiving step 
 further receives the control information including an indication information to indicate whether the    time information is present,    wherein the managing step includes steps of checking whether the time information is present based on the indication information, determining whether the digital content can be played according to the time information if the indication information is present as a result of checking step, and controlling the playback of the digital content as a result of determining step.    
   
   
       8 . The method of  claim 1 , wherein the managing step manages the digital content to be not edited without an authority, based on the protection information.  
   
   
       9 . The method of  claim 1 , wherein the time information and the protection information are bound to prevent the digital content from unauthorized access.  
   
   
       10 . A method of managing digital content, comprising: 
 receiving a digital content, a control information including an indication information to indicate whether a time information to restrict a playback of the digital content is present, the time information present alternatively according to the indication information, and a protection information preventing the digital content from modifying; and    managing the digital content according to the control information and the protection information,    
   
   
       11 . The method of  claim 10 , wherein the managing step 
 includes steps of checking whether the time information is present based on the indication    information, analyzing whether the time information indicates a relative time or an absolute time    if the time information is present as a result of checking step, the relative time being counted    from the start of playback for the digital content, and the absolute time being counted from the    receiving of the digital content,    determining whether the digital content can be played according to the relative time or absolute time as a result of analyzing step, and controlling the playback of the digital content as a result of determining step.    
   
   
       12 . The method of  claim 11 , wherein the determining step includes a step of comparing the time information with a current time if the time is absolute time, and the controlling step controls the playback of digital content as a result of comparing step.  
   
   
       13 . The method of  claim 11 , wherein the determining step includes a step of comparing the time information with a counted time to access if the time is relative time, and the controlling step controls the playback of digital content as a result of comparing step.  
   
   
       14 . The method of  claim 10 , wherein the managing step manages the digital content to be not edited without an authority, based on the protection information.