KR100537837B1 - Method for managing a recorded stream on rewritable optical disc - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of managing a playlist of a rewritable recording medium, wherein an A / V stream in a clip unit continuously recorded at a time in a playlist (PlayList) of a recording medium such as a high-density rewritable optical disc (BD-RW). Broadcasts for which copyright protection is required by separately recording identification information and deletion time information for automatic deletion over time with reference to the recorded information, and automatically deleting and processing the A / V stream of the corresponding clip unit by referring to the recorded information. It is possible to prevent a user from repeatedly playing back a program or a movie or the like or editing illegally.

Description

Method for managing a recorded stream on rewritable optical disc

The present invention relates to a method for enabling automatic temporal deletion of video and audio streams recorded and stored on a recording medium such as a rewritable optical disc.

Recently, standardization work on new high-density rewritable optical discs, such as 'Blu-ray Disc Rewritable' (hereinafter referred to as BD-RW), that can record and store high-quality video data and high-quality audio data for a long time. With rapid progress, it is expected that related products will be developed, released and commercialized.

FIG. 1 shows a part of an optical disc device such as a video disc recorder (VDR) for recording or reproducing a signal on a recording medium such as a BD-RW. The optical disc device includes a BD-RW or the like. An optical pickup 2 for reading out a signal recorded on the same recording medium 1 or for recording an input signal processed data stream from the outside; A VDR system (3) for reproducing a signal read out from the optical pickup (2) or converting a data stream input from the outside into a data stream suitable for recording; The encoder 4 may be configured to encode an analog signal input from the outside and output the same to the VDR system 3.

On the other hand, A / V streams in clip units recorded and stored on the BD-RW 1, for example, A / V streams (Clip 1 A / V Streams) and second clips of the first clips recorded successively at a time, respectively. Clip 2 A / V streams, as shown in Fig. 2, contain playback control information for automatically reading and reproducing these, which are automatically generated at the time of recording the A / V stream. It is managed by the first real playlist (Real PlayList 1) and the second real playlist (Real PlayList 2).

In addition, a playlist may be selected to refer to the sections by selectively selecting some or all sections from the A / V stream clips recorded as described above, and the created playlists are called virtual playlists. do. In the example of FIG. 2, the virtual playlist includes a play item (PlayItem) of a main path for reading out and playing back an A / V stream of a first clip associated with the first actual playlist, and the second actual playlist. A sub play item (Sub PlayItem) of a sub path for reading out and reproducing the A / V stream of the associated second clip can be recorded and managed.

therefore. In the VDR system 3 of the optical disc apparatus, during a series of reproducing operations for reading out and reproducing an A / V stream of a first clip linked to and managed by the first actual playlist, the user, at the request of the user, The A / V stream of the second clip linked to and managed by the second actual playlist can be selectively played back.

Meanwhile, in the VDR system 3, the A / V stream of the first clip or the A / V stream of the second clip is partially deleted or edited according to a user's request. For example, as shown in FIG. As described above, when a part of the A / V stream of the second clip is deleted, the remaining A / V stream from which the part of the second section is deleted is the A / V stream of the second clip and the A / V of the third clip. In addition to partition management by stream, a second real playlist and a third real playlist including recorded playback control information for reading and playing back the A / V streams are generated and recorded and managed.

In addition, a virtual playlist is generated and recorded in order to allow a user to arbitrarily select, edit, and reproduce the actual playlists recorded and managed through the above process. For example, in the virtual playlist, the first playlist may be generated. A play item of a main path for reading out and reproducing an A / V stream of a first clip associated with an actual playlist, and a sub path for reading out and reproducing an A / V stream of a third clip associated with the third actual playlist; The sub play items of can be recorded and managed together at the same time.

therefore. In the VDR system 3 of the optical disc apparatus, during a series of reproducing operations for reading out and reproducing an A / V stream of a first clip linked to and managed by the first actual playlist, the user, at the request of the user, The A / V stream of the third clip linked to and managed by the third actual playlist can be selectively played back.

However, in the above-described optical disc device, the A / V stream in the recorded clip unit can be arbitrarily edited according to the user's request, and the A / V stream in the clip unit can be repeatedly reproduced. In addition, users can repeatedly play or illegally edit their own broadcast programs or movies that require paying, and there is no solution to effectively prevent them. .

Accordingly, the present invention was created in view of the above-described circumstances, and for the purpose of monetization and copyright protection of unique broadcast programs and movies recorded on a recording medium such as a high-density rewritable optical disc (BD-RW), the clip It is an object of the present invention to provide a method for allowing automatic deletion of a unit of A / V streams over time.

According to an aspect of the present invention, a method of managing a recording stream of a rewritable recording medium includes: recording a data stream of a clip unit having a temporal continuity on a rewritable recording medium; And two steps of additionally recording management information for automatically deleting the data stream in the clip unit after a predetermined time in a playlist.

According to another aspect of the present invention, there is provided a method of managing a recording stream of a rewritable recording medium, comprising: recording an automatic deletion flag and deletion time information included in a playlist corresponding to a data stream of a clip unit recorded with time continuity on a rewritable recording medium; Step 1 to confirm the search; And determining whether to automatically delete the data stream in the clip unit by referring to the automatic deletion flag and the deletion time information.

Hereinafter, a preferred embodiment of a recording stream management method of a rewritable recording medium according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 shows the file structure of a rewritable optical disc (BD-RW). In the BD-RW, at least one DVR directory is placed under a root directory at the top, and one 'info.dvr' is located below it. PLAYLIST subdirectory, which contains files, 'menu.tidx' files, and 'mark.tidx' files, and also contains a plurality of real and virtual playlist files (* .rpls, * .vpls), and a plurality of clip information. A fixed specific file structure having a CLIPINF subdirectory in which files (* .clpis) are recorded and a STREAM subdirectory in which a plurality of recording data stream files (* .m2ts) corresponding to each clip information file are recorded. ) Is used.

On the other hand, various reproduction control information for the recording data stream file included in the STREAM subdirectory, for example, the file '01001.m2ts' and the file '02002.m2ts' are recorded and included in the ClLIP subdirectory. clpi 'and' 02002.clpi 'files are recorded and stored, and the playlist information for determining the link playback and playback order for the' 01001.m2ts' file and the '02002.m2ts' file is the PLAYLIST subdirectory. It can be recorded and stored in the file '01001.rpls' to be recorded.

Further, in the syntax of the playlist file (* .rpls, * .vpls), for example, the actual playlist file (xxxx.rpls), as shown in Fig. 5, the version number and the playlist start address are shown. A playlist mark start address, a maker private data start address, and a user interface application information playlist (UIAppInfoPlayList). The user interface application information playlist is automatically deleted by one bit according to an embodiment of the present invention. A flag (time_bomb_flag) and its deletion time information (expire_time_info.) Are recorded.

That is, when the auto delete flag is set to '1' to prevent the user from randomly repeatedly playing or editing an A / V stream that requires copyright protection and monetization, the A / V stream of the corresponding clip unit is set to '1'. The deletion time information for automatically deleting the V stream is additionally recorded, and the auto deletion flag allocates one bit of a four bit spare area for word alignment of a predetermined recording size, or one of another free area. Bits can be allocated and used.

In addition, the deletion time information may be additionally recorded as absolute time information irrelevant to the reproduction start time or additionally recorded as relative time information counted after the reproduction start time. It may be included in the received A / V stream. If it is not included in the received A / V stream, the disc recorder may set the erase time and set the value for the auto erase flag to record. In this case, the deletion time may be set as a predetermined period, for example, after 6 hours.

After such recording, the VDR system 3 of the optical disc apparatus searches for and confirms the deletion time information stored in association with the automatic deletion flag with respect to the recording stream in which the automatic deletion flag is set to '1'. By automatically deleting the A / V stream, it is possible to prevent the user from repeatedly playing or unlimitedly editing, which will be described in detail as follows.

Fig. 6 shows an operation flowchart of an embodiment of a method for managing a recording stream of a rewritable recording medium according to the present invention. For example, in the VDR system 3, a clip recorded and stored in the BD-RW 1 is shown. When the user requests to play an A / V stream of any one clip among the A / V streams of the unit (S30), after searching the playlist corresponding to the A / V stream of the clip unit, the playlist The user interface application information playlist (UIAppInfoPlayList) recorded in the search is checked (S31).

In the VDR system 3, the automatic deletion flag (time_bomb_flag) recorded in the user interface application information playlist is searched and confirmed (S32). For example, the automatic deletion flag is set to '1'. If so, the deletion time information (expire_time_info.) Stored in association with the automatic deletion flag is searched and confirmed (S34).

Then, when the deleted time recorded and stored as the absolute time information irrelevant to the searched and confirmed deletion time information, for example, the playback start time, is equal to the current time or is earlier than the current time (S35), the clip The A / V stream is determined to be a unique broadcast program or a movie required for copyright protection or a fee, and the A / V stream is deleted (S36).

On the other hand, in the VDR system 3, when the automatic deletion flag (time_bomb_flag) found and searched through the above process is set to '0' or the deletion time information (expire_time_info) is later than the current time. In step S37, a normal playback operation is performed according to a user's request.

For reference, in the VDR system 3, when the deletion time information (expire_time_info) is additionally recorded as relative time information counted from the start of playback of the A / V stream in the clip unit, the clip unit is used. The time since the start of the A / V stream playback is counted, and the counted time and the erase time information are compared.

If the time after the counted first reproduction matches or exceeds the deletion time information, the A / V stream is deleted. On the other hand, the time after the counted reproduction is the deletion time. If less than the information, the normal playback operation is performed according to the user's request.

For reference, in the user interface application information playlist (UIAppInfo PlayList), after further recording an edit prevention flag (edit_protect_flag) for preventing a user from partially deleting or arbitrarily editing the A / V stream of the corresponding clip unit, The edit prevention flag, the automatic deletion flag, and the deletion time information can be correlated with each other, so that copyright protection and monetization of a unique broadcast program or movie can be efficiently performed.

As mentioned above, preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.

The method of managing a recording stream of a recordable recording medium according to the present invention described above is that the user repeatedly reproduces or illegally edits the digital content that requires copyright protection recorded on the recording medium. Can be prevented.

1 shows a part of an optical disk device such as a video disk recorder (VDR),

2 and 3 illustrate a state in which an A / V stream in a clip unit recorded on a rewritable optical disc BD-RW, an actual playlist, and a virtual playlist are associated with each other.

4 shows the file structure of a rewritable optical disc (BD-RW),

FIG. 5 illustrates an actual playlist syntax in which an automatic deletion flag (time_bomb_flag) is additionally recorded by a recording stream management method according to an embodiment of the present invention.

6 is a flowchart illustrating a method of managing a recording stream of a rewritable recording medium according to an embodiment of the present invention.

※ Explanation of code for main part of drawing

1: Optical disc 2: Optical pick-up

3: VDR system 4: Encoder

Claims (10)

In addition to recording digital data, information for limiting the reproduction time of the digital data, identification information indicating the presence of information for limiting the reproduction time of the digital data, and data such as random deletion or editing of the digital data. And recording information for preventing change. The method of claim 1, And the information for limiting the reproduction time is relative time information counted from a time at which reproduction of the digital data starts. The method of claim 1, And the information for limiting the reproduction time is absolute time information irrespective of the time at which reproduction of the digital data starts. The method of claim 1, And the information for limiting the reproduction time is not recorded when the identification information is set and recorded as that information for limiting the reproduction time does not exist. The method of claim 1, And information for limiting the reproduction time and information for preventing the change of the data are recorded with mutual correlation for copyright protection of the digital data. Digital data is recorded, information for limiting the reproduction time of the digital data, identification information indicating the presence of information for limiting the reproduction time of the digital data, and data change such as random deletion or editing of the digital data. And digital information is recorded together. The method of claim 6, And the information for limiting the reproduction time is relative time information counted from a time at which reproduction of the digital data starts. The method of claim 6, And the information for limiting the reproduction time is absolute time information irrespective of the time at which reproduction of the digital data is started. delete The method of claim 6, And information for limiting the reproduction time and information for preventing the change of the data are recorded in a correlation with each other for copyright protection of the digital data.