KR100627005B1 - Method for reproducing digital data - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reproducing digital data, for example, to an A / V stream in units of clips recorded continuously at a time in a playlist (PlayList) of a recording medium such as a high-density rewritable optical disc (BD-RW). By separately recording identification information and time-of-deletion information for automatic deletion over time, and referring to the recorded information, the A / V stream of the corresponding clip unit is automatically deleted and processed so that a broadcast program requiring copyright protection or It is possible to prevent the user from repeatedly playing a movie or the like or editing illegally.

Rewritable Optical Disc, Playlist, User Interface Application Information Playlist, Auto Delete Flag, Delete Time Information

Description

How to play digital data {Method for reproducing digital data}

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 according to an embodiment of the present invention.

6 is a flowchart illustrating an operation of a digital data reproduction method 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

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 recorded A / V stream clips. The playlist thus created is called a virtual playlist. . 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 divided into 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.

In the digital data reproducing method according to the present invention for achieving the above object, the reproduction time of the digital data is limited from the identification information indicating whether there is information for limiting the reproducing time of the digital data at the time of digital data reproduction; Determining whether information to be present exists; If it is determined from the identification information that there is information for limiting the reproduction time of the digital data, analyzing the information for limiting the reproduction time; And if the analysis result indicates that the information for limiting the reproduction time is currently reproducible, permitting the reproduction of the digital data, and if the reproduction is impossible, controlling the reproduction of the digital data. However, the information for limiting the reproduction time is characterized in that the relative time information counted from the start of the reproduction of the digital data or the absolute time information irrespective of the reproduction start time of the digital data.

Hereinafter, a preferred embodiment of a digital data reproduction method 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 playback list start are shown. An address, a playlist mark start address, a maker private data start address, and a user interface application information playlist (UIAppInfoPlayList), and the like. The user interface application information playlist includes one bit of automatic data according to an embodiment of the present invention. The delete flag (time_bomb_flag) and its delete 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 digital data reproducing method according to the present invention. For example, in the VDR system 3, A / V in units of clips recorded and stored in the BD-RW 1 is shown. When the user requests to play an A / V stream in any one clip among the streams (S30), the user searches for a playlist corresponding to the A / V stream in the clip unit and records the user included in the playlist. The interface application information playlist (UIAppInfoPlayList) is searched and 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 that requires 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 digital data reproduction method according to the present invention described above can prevent the user from repeatedly playing or illegally editing the digital content that requires copyright protection recorded on the recording medium.

Claims (7)

Determining whether information for limiting the reproduction time of the digital data exists from identification information indicating whether there is information for limiting the reproduction time of the digital data when the digital data is reproduced; If it is determined that there is information for limiting the reproduction time of the digital data from the identification information, whether the information for limiting the reproduction time is relative time information counted from the start of reproduction of the digital data or whether Analyzing whether the absolute time information is independent of the reproduction start time; And And, if the analysis results indicate that the information for limiting the reproduction time is currently reproducible, permitting the reproduction of the digital data, and if the reproduction is impossible, controlling the reproduction of the digital data. A digital data reproduction method. The method of claim 1, And the control step controls to perform the reproduction of the digital data when the current time is present and indicates the relative time information. The method of claim 2, And reproducing the digital data if there is no current playback time remaining. The method of claim 1, In the controlling step, when the time information exists and indicates absolute time information, the time information is compared with the current time, and when the playback time remains, the digital data is controlled to perform reproduction of the digital data. How to play data. The method of claim 4, wherein And reproducing the digital data if the reproducing time does not remain as a result of the comparison. The method of claim 5, And controlling to delete the digital data. The method of claim 1, And reproducing the digital data when there is no information for limiting the reproduction time in the analyzing step.

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