JP2002158859A - Method and system for embedding electronic watermark, recording medium storing program for embedding electronic watermark and medium for recording contents data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a system which can obtain contents data embedded with desired electronic water mark information at a high speed for a service where different electronic watermark information is embedded for every delivery of contents, or a service requiring high speed electronic watermark embedding processing, and a medium storing a program for embedding an electronic watermark and a medium for recording contents. SOLUTION: Contents data comprises two or more of piratical data, and a contents data base comprising respective partial data embedded with a bit or a bit sequence, as an electronic watermark, for all possible bits or a small bit sequence is generated. The method for embedding an electronic watermark comprises a step for selecting corresponding partial data for each bit in a bit sequence or a small bit sequence of an electronic watermark being embedded, and a step for generating contents data embedded with an electronic watermark by patching selected partial data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital watermark embedding method and apparatus, a storage medium storing a digital watermark embedding program, and a content data recording medium. In particular, it is difficult to separate information superimposed on information content. TECHNICAL FIELD The present invention relates to a digital watermark embedding method and apparatus for embedding a digital watermark, a storage medium storing a digital watermark embedding program, and a content data recording medium.

[0002] Multimedia copyrighted works are liable to be illegally duplicated or tampered with, which hinders legitimate secondary use by information users and information transmission by content providers. ing. “Digital watermarking technology” is a technology that uses the redundancy of media such as images and sounds to embed another sub-information in the information content that is the main information so as not to be perceived by humans. This technique is considered as an effective means for protecting the copyright of a multimedia work because it is difficult to separate information content and information superimposed on the information content. The present invention relates to a digital watermark embedding method and apparatus for copyright protection, a storage medium storing a digital watermark embedding program, and a content data recording medium.

[0003]

2. Description of the Related Art Japanese Patent Application No. Hei 11
-16218 "Digital watermarking method and apparatus, and storage medium storing digital watermarking program" or Japanese Patent Application No. 11-162.
19, "A digital watermarking method and apparatus, a storage medium storing a digital watermarking program, and a digital watermarking system".

[0004] As the digital watermarking method, watermark information to be embedded is different depending on the application, but the following are common applications.

[0005] A content provider embeds information about a copyright holder as a digital watermark, and a content user uses the information to inquire about an inquiry destination such as usage conditions related to the content. An electronic watermark is embedded in advance.

A content provider embeds information about a content user as an electronic watermark, and uses the content to determine the source when the content user publishes the content on the Internet or the like without permission. The digital watermark is embedded at the time of content distribution.

[0007]

However, in the above-mentioned conventional digital watermark embedding method, basically, the digital watermark varies depending on the media to be subjected to digital watermark processing. Since the digital watermark has a large data amount, the processing time of the digital watermark poses a problem, and it is difficult to embed the digital watermark at the time of content delivery as described above.

The present invention has been made in view of the above points, and is generally applicable to a service that needs to perform digital watermark embedding processing at a high speed, such as a service that embeds different digital watermark information every time content is delivered. It is an object of the present invention to provide a digital watermark embedding method and apparatus capable of quickly obtaining content data in which desired digital watermark information is embedded, a storage medium storing a digital watermark embedding program, and a content data recording medium. .

[0009]

FIG. 1 is a diagram for explaining the principle of the present invention.

[0010] The present invention (claim 1) provides a digital watermark embedding method for embedding a digital watermark in content data.
The content data is composed of at least two or more partial data, and for all possible bits or small bit strings, a bit pattern content database consisting of partial data in which bits or small bit strings are embedded as an electronic watermark is generated in advance. (Step 1), a step of selecting partial data corresponding to each bit or each small bit of a digital watermark bit string to be embedded from the content database (Step 2), A step (step 3) of connecting the partial data to generate digital watermark embedded content data.

FIG. 2 is a block diagram showing the principle of the present invention.

The present invention (claim 2) is a digital watermark embedding device for embedding a digital watermark in content data,
The content data is composed of at least two or more partial data, and for all possible bits or small bit strings, a bit pattern content database 109 including partial data in which bits or small bit strings are embedded as an electronic watermark is generated. A data generating unit 101 for selecting a partial data corresponding to each bit or a small bit of a digital watermark bit string to be embedded from the bit pattern content database 109; Content data generating means 210 for connecting data to generate digital watermark embedded content data.

According to a third aspect of the present invention, there is provided a storage medium storing a digital watermark embedding program for embedding a digital watermark in content data, wherein the content data is composed of at least two or more partial data. A process of generating a bit pattern content database composed of partial data in which a bit or a small bit string is embedded as a digital watermark for a certain all bit or a small bit string, and a process of generating a digital watermark to be embedded from the bit pattern content database. It has a process of selecting partial data corresponding to each bit or each small bit of the bit string, and a process of generating the digital watermark embedded content data by connecting the selected partial data. The present invention (Claim 4) is a content data recording medium storing content data, wherein the content data is composed of at least two or more partial data, and all possible bits or small bit strings have bits or bits. , Each part data in which a small bit string is embedded as a digital watermark, and at least one content composed of at least two or more of the partial data is recorded.

As described above, according to the present invention, a process for preparing in advance digital watermark embedded content data for each of several bit patterns (bits or small bit strings) and a process for preparing digital watermark embedded information By dividing and selecting data from those patterns and combining them to create digital watermark embedded content data, the former process is performed in advance at the time of content generation, and is performed at the time of content distribution. By performing the latter processing when the digital watermark processing is actually required, the processing time of the digital watermark can be reduced even if the data amount is large. This is because the processing amount of the part in which the digital watermark embedded content data of some patterns is created in advance is enormous, and it takes about the same time as the conventional digital watermark embedding processing. Since the processed content data is created by connecting content data in which several patterns of digital watermarks have been embedded, the processing amount is very small and high-speed processing is possible.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital watermark embedding method to which the present invention can be applied is a digital watermarking method for dividing content data into an appropriate data amount and embedding several bits of digital watermark information in each of the divided content data. It is.
The digital watermark embedded content data to be delivered by joining the divided content data created in this way is generated.

First, a process for generating data used for embedding a digital watermark in advance will be described.

FIG. 3 shows the configuration of a digital watermark embedding system according to the present invention.

The digital watermark embedding system shown in FIG.
Bit pattern creation apparatus 101 which outputs content data in which a digital watermark is embedded for each bit pattern to bit pattern content DB 109 with input as 03
And a content synthesizing device 201 which receives the content data of the bit pattern content DB 109 and the digital watermark information 203 and outputs the content data with the digital watermark embedded therein to the delivery content DB 211.

The bit pattern creating device 101 includes a content data decomposing unit 104, a digital watermark embedding unit 1
06, a digital watermark embedded database 107, a content data restructuring unit 108, and a bit pattern content database 109.
2 and the digital watermark parameter 103 as input, and creates content data in which a digital watermark of a bit pattern is embedded.
09 is output.

The content data decomposing unit 104 obtains the input content data 102, decomposes the content data into digital watermark processing units, generates decomposed data 105, and sequentially performs a digital watermark embedding process. Sent to the unit 106.

A digital watermark embedding unit 106 embeds a digital watermark in the decomposed data 105 for each bit pattern in accordance with a digital watermark parameter 103 having an information amount corresponding to the size of the decomposed data 105. The decomposed data 107 is output. However, since the generated decomposed data 107 needs to generate a result in which digital watermark information of all bit pattern combinations is embedded in one decomposed data 105, the digital watermark embedded in each decomposed data 105 is required. There are as many as the number of all combinations of information bit patterns. Generally, since digital watermark information is a bit pattern, if the amount of digital watermark information that can be embedded in each partial data is n, the total number of combinations of digital watermark information is 2 ⁿ .

The disassembled data in which the digital watermark of the bit turn created in this way is embedded is stored in the disassembled database 107 in which the electronic watermark is embedded.

The content data reconstructing unit 108 reconstructs the data embedded with the digital watermark of the bit pattern stored in the digital watermark embedded decomposition database 107 into the same format as the input content data 102.

Finally, the bit pattern creating device 101
Outputs a bit pattern content database 109 in which a digital watermark is embedded for each bit pattern.

The bit pattern content database 109 is used in the content synthesizing apparatus 201 described below. When a plurality of content synthesizing apparatuses 201 exist, the bit pattern content database 109 may be shared and used between the content synthesizing apparatuses 201, or may be owned by each content synthesizing apparatus 201. Is also good.

Next, a description will be given of a process up to creation of the digital watermark embedded decomposition database 107 in the bit pattern creation device 101.

FIG. 5 is a flowchart for explaining the operation of the bit pattern creation device of the present invention.

Step 101) The content data 102 and the digital watermark parameter 103 are input to the bit pattern creation device 101.

Step 102) The digital watermark embedding processor 106 sets the bit pattern b0, b1, b1 of the length n to n, where n is the bit length of the digital watermark information to be embedded in the decomposed data 105 generated by the content data decomposer 104.
, Bn are generated.

Step 103) The content data decomposing unit 104 decomposes the input content data 102 into a size of a watermark processing unit.

Step 104) The digital watermark embedding processor 106 embeds a digital watermark of the bit pattern b0, b1,..., Bn in the decomposed data 105.

Step 105) All decomposition data 1
If the processing of step 103 and step 104 is completed for step 05, the process proceeds to step 106, and if not, the processing of step 103 is repeated.

Step 106) The digital watermark embedding unit 106 outputs the content data in which the digital watermark information of the bit patterns b0, b1,..., Bn is embedded to the digital watermark embedded decomposition database 107.
The content data in which the digital watermark information (bit @ turn) is embedded is transferred to the bit pattern generation device 10.
1 may be stored in the memory.

Step 107) If the above processing has been completed for all the bit patterns, the processing is terminated, and if not, the processing proceeds to step 102.

Thus, the content data reconstructing unit 1
In step 08, data in the digital watermark embedded decomposition database 107 created as described above is sequentially read, reconstructed into content data in the same format as the input content data 102, and stored in the bit pattern content database 109. I do.

Next, the content synthesizing apparatus 201 will be described.

FIG. 6 shows the configuration of the content synthesizing apparatus of the present invention.

The content synthesizing device 201 receives the digital watermark information 203 and the content data in which the digital watermark for each bit pattern is embedded from the bit pattern content database 109 created by the bit pattern creating device 101. The information and the content data with the digital watermark embedded for each bit pattern are synthesized, and the content data 211 with the digital watermark embedded is output. The content synthesizing device 201 includes a digital watermark information distribution unit 204, a data selection unit 206, a data extraction unit 208, and a data synthesis unit 210.

The digital watermark information distribution unit 204 receives the digital watermark information 203 as an input. As described above, the digital watermarking method used in the present invention divides content data into appropriate data amounts and embeds several bits of digital watermark information in each of the divided data. When embedding the input digital watermark information 203 into each divided data, the distribution unit 204 determines which bit data is to be embedded in which divided data (partial data). A bit pattern 205 is generated for each piece of bit information to be embedded in each divided data, and sent to the data selection unit 206 in order.

Hereinafter, the watermark embedding process is performed for each divided data.

The data selector 206 selects the content data 207 in which the digital watermark of the bit pattern input from the bit pattern content database 109 created by the bit pattern generator 101 is embedded.

The data extracting unit 208 extracts the partial content data 209 at the data position corresponding to the currently processed divided data from the content data 207 in which the information to be embedded is embedded, and sends it to the data synthesizing unit 210.

The data synthesizing section 210 reconstructs the digital watermark embedded partial data sent from the data extracting section 208 sequentially in accordance with the order in which the content data 102 is divided, and the digital watermark information 203 embedded content data. 211 is obtained.

The content data 211 can be stored in a database and used in a device that distributes content data in which a digital watermark is embedded.

FIG. 7 is a flowchart showing the operation of the content synthesizing apparatus of the present invention.

Step 201) The digital watermark information 203 is input to the digital watermark information distribution unit 204. Here, the digital watermark parameter 103 used in the bit pattern generation device 101 may be input as needed.

Step 202) The digital watermark information distribution section 204 generates a bit pattern (eg, b'0, b'1,..., B'n) of digital watermark information to be embedded in each of the decomposed data.
Generate

Step 203) Data selection unit 206
Is a bit pattern of the bit pattern content database 109 (for example, b′0, b′1,..., B′n)
The content data (content data in which the digital watermark information of the bit pattern is embedded) corresponding to the partial data B currently being processed is selected from the content data in which the digital watermark is embedded. Further, the data extraction unit 208 selects partial data B ′ corresponding to the partial data B currently being processed from the selected content data.

Step 204) If all partial data have been processed, the process proceeds to step 205; otherwise, the process proceeds to step 202.

Step 205) When all the partial data have been processed, the data synthesizing section 210
Content data is reconstructed from the extracted partial data to obtain content data 211 in which digital watermark information 203 is embedded.

[0051]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 8 shows an example of a digital watermark embedding process according to an embodiment of the present invention.

Here, the following conditions are set in order to simplify the model.

1. The digital watermarking method used for the processing is to embed one bit into each divided data.

2. The digital watermarking process for each divided data is performed in order from the upper left to the lower right.

3. It is assumed that the number of bits of the digital watermark information to be embedded is simply the same as the number of divided data, and is embedded in each divided data in order from the upper bit.

However, the upper left alphabet of each divided data is for identifying each divided data.

First, the bit pattern generation device 101
From the original content data 103, content data 1090 and 1091 in which the same bit pattern digital watermark is embedded in all divided data.
Is generated. That is, the bit pattern creation device 101
As a result, two types of content data 1090 in which a digital watermark of bit pattern 0 is embedded and content data 1091 in which a digital watermark of bit pattern 1 is embedded are generated. The data in which the digital watermark of the bit pattern is embedded can be stored in a database in advance and used in the content synthesizing apparatus 201. In the present embodiment, it is assumed that the content data is stored in the bit pattern content database 109.

The content synthesizing device 201 sequentially stores the bit pattern content database 1 created in advance in the order of the digital watermark information 203 (001101) from the higher order to the lower order.
09, the divided data is selected in order from the upper left to the lower right of the corresponding divided data of the content data in which the electronic watermark 09 is embedded.

The selection method is based on the digital watermark information 203 (0
The content data in which the bit pattern corresponding to each bit value of the watermark bit pattern is embedded is selected in the order from upper to lower in (01101). In the example shown in the figure, the divided data A → B → I → J → E → L of the content data 1090 in which the digital watermark of the bit pattern 0 is embedded and the content data 1091 in which the digital watermark of the bit pattern 1 is embedded are selected in this order. I do. The finally selected divided data A, B, I, J, E, and L are combined (reconstructed) by the data synthesizing unit 210 to obtain content data 211 in which a digital watermark is embedded.

FIG. 8 shows an example of the reconstruction. In the content data in which a digital watermark of a certain bit pattern is embedded, n = 1 when the number of bits that can be embedded in the partial data is n. In practice, content data in which a digital watermark of 2 ⁿ bit patterns is embedded is generated. From these 2 ⁿ contents, partial data of the content data in which the desired digital watermark is embedded is selected and combined.

The content data 211 in which the digital watermark created in this way is embedded can be stored in a database, and can be used in an apparatus that distributes the content data.

Although the above embodiment has been described based on the configurations shown in FIGS. 4 and 6, the operations of the bit pattern creation device 101 and the content synthesizing device 201 are constructed as programs, and the bit pattern creation device Disk device connected to a computer used as a content synthesizing device, floppy (registered trademark) disk, CD
-The present invention can be easily realized by storing the program in a portable storage medium such as a ROM or the like and installing it when implementing the present invention.

The present invention is not limited to the above embodiment, but can be variously modified and applied within the scope of the claims.

[0065]

As described above, according to the present invention, the processing time is generally shortened for services that require high-speed digital watermark embedding processing, such as services that embed different digital watermark information for each content delivery. The roughest turtle processing is performed on the processing part that required the most, and if necessary, the data that has been subjected to the digital watermark embedding processing is combined in advance to obtain the content data in which the desired digital watermark information is embedded at high speed. Will be able to do it. In particular, the digital watermarking process for moving image data requiring a large amount of processing time is most effective.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the principle of the present invention.

FIG. 2 is a principle configuration diagram of the present invention.

FIG. 3 is a configuration diagram of a digital watermark embedding system of the present invention.

FIG. 4 is a configuration diagram of a bit pattern creation device of the present invention.

FIG. 5 is a flowchart for explaining the operation of the bit pattern creation device of the present invention.

FIG. 6 is a configuration diagram of a content synthesizing apparatus according to the present invention.

FIG. 7 is a flowchart showing the operation of the content synthesizing device of the present invention.

FIG. 8 is an example of a digital watermark embedding process according to an embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 101 Bit pattern content database generating means, bit pattern creating device 102 Content data 103 Digital watermark parameter 104 Content data decomposing unit 105 Decomposed data 106 Digital watermark embedding processing unit 107 Digital watermark embedded decomposition database 108 Content reconstructing unit 109 Bit pattern content database 201 Content Synthesizing Device 203 Digital Watermark Information 204 Digital Watermark Information Distribution Unit 205 Bit Pattern of Digital Watermark to be Embedded in Each Decomposed Data 206 Data Selection Means, Data Selection Unit 207 Digital watermark information of a bit pattern corresponding to the digital watermark information to be embedded is embedded Content data 208 Data extraction unit 209 Bit pattern electronic watermark corresponding to digital watermark information to be embedded Partial content data 210 content generation means information is embedded by the content data that the data combining unit 211 shipping content database, a digital watermark is embedded

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yoichi Takashima 2-3-1 Otemachi, Chiyoda-ku, Tokyo F-term in Nippon Telegraph and Telephone Corporation (reference) 5B057 CC03 CE08 5C053 FA13 FA15 FA23 KA05 5C076 AA14 BA06 5J104 AA14

Claims (4)

[Claims] 1. A digital watermark embedding method for embedding a digital watermark in content data, wherein the content data is composed of at least two or more partial data, and all possible bits or small bit strings are bit or small. A content database composed of partial data in which a bit string is embedded as a digital watermark is generated, and from the content database, partial data corresponding to each bit or each small bit of a digital watermark bit string to be embedded is extracted. A digital watermark embedding method, comprising the steps of: selecting and connecting the selected partial data to generate digital watermark embedded content data. 2. An electronic watermark embedding device for embedding an electronic watermark in content data, wherein the content data is composed of at least two or more partial data, and all possible bits or a small bit string are represented by bits or bits. Database generating means for generating a bit pattern content database composed of each partial data in which a small bit string is embedded as a digital watermark; and from the bit pattern content database, each bit of the bit string of the digital watermark to be embedded or
A digital watermark, comprising: data selecting means for selecting partial data corresponding to each small bit; and content data generating means for generating digital watermark embedded content data by connecting the selected partial data. Implanting device. 3. A storage medium storing a digital watermark embedding program for embedding a digital watermark in content data, wherein the content data is composed of at least two or more partial data and all possible bits or small bits are stored. For the bit string, a process of generating a bit pattern content database composed of each partial data in which a bit or a small bit string is embedded as a digital watermark, and, from the bit pattern content database, each bit of the bit string of the digital watermark to be embedded or ,
Storing a digital watermark embedding program, comprising: a process of selecting partial data corresponding to each small bit; and a process of generating digital watermark embedded content data by joining the selected partial data. Storage media. 4. A content data recording medium storing content data, wherein the content data is composed of at least two or more partial data, and for all possible bits or small bit strings, bits or small bit strings. Have each partial data embedded as a digital watermark, and at least 2
A content data recording medium on which at least one content composed of one or more partial data is recorded.