WO2002060179A1

WO2002060179A1 - Method and apparatus for copy protection, and copy protection program

Info

Publication number: WO2002060179A1
Application number: PCT/JP2001/000506
Authority: WO
Inventors: Toshiro Obitsu; Hisamichi Higuchi
Original assignee: Fujitsu Limited
Priority date: 2001-01-26
Filing date: 2001-01-26
Publication date: 2002-08-01

Abstract

A method is provided for determining whether a video medium is DVD or not during playback on a computer with video output terminals using a DVD playback application. If the video uses MPEG 2 compression and overlay is 640 pixels 480 by pixels or above, the video is judged to be DVD. In that case, the video output of the computer is turned OFF.

Description

Description Copy prevention apparatus, copy prevention method, and program for executing copy protection

The present invention relates to a duplication preventing device, a duplication preventing method, and a program for executing duplication prevention for preventing duplication in a reproduction device having no duplication preventing function. Background art

In recent years, as the performance of personal computers has improved, DVD video discs (hereinafter referred to as “DVD”) can now be played in software, not in hardware, but only in playback applications. Soft playback has the feature that it does not depend on the PC itself as long as the performance of the PC used for playback satisfies a certain standard and a DVD-ROM drive can be connected. On the other hand, DVDs that cannot be copied by commercially available DVD players cannot be copied to VCRs or the like due to protection against duplication. For example, a method of preventing duplication by outputting a television signal based on the macrovision standard in hardware is widely used. Also, personal computers that have a TV output terminal (including a composite or S terminal) and are equipped with a DVD-ROM drive at the time of manufacture also have a copy protection function like a DVD player.

However, if a computer with a TV output terminal does not consider the connection of the DV D-ROM drive at the time of basic design and does not have a hardware duplication prevention function, there is a risk of illegal copying when playing DVD software. Therefore, DVD playback on such a system was prohibited. In other words, if the personal computer has the ability to play DVDs softly but does not have a copy protection function, it will not be possible to play DVD on the personal computer, which limits the expandability of the personal computer. Had a problem.

Conventional copy protection functions include, for example, Japanese Patent Application Laid-Open No. 2000-23089. The report states that embedding a digital watermark makes it impossible to reproduce digital video information copied by directly recording RF signals from a digital disk onto another digital disk.

Also, Japanese Patent Application Laid-Open No. 2000-20969 discloses a device for inputting digital sound / image data per se, which uses digital watermark information embedded in the input data. A method is described in which a device reads the data and feeds it back to a storage control means of the device, and stores only a copy-permitted one in a media. Furthermore, in Japanese Patent Application Laid-Open No. Hei 10-174507, when a video signal subjected to copy protection processing is input from an external device, the device described in the Japanese Patent Application Publication No. Although the video signal is output through the loop, a method is described in which the video recording function of the device is protected by detecting and notifying a copy flag indicating the prevention of duplication in digital video.

Each of the inventions described in the above three publications prevents duplication by embedding a digital watermark in digital information.However, the amount of hardware required to read digital watermark information from a digital disk increases. In other words, the cost is high. Furthermore, the above-mentioned invention relates to a recording method of a digital disk, and does not serve as a means for solving a problem of a device that cannot output a video because it does not have a copy protection function.

The present invention has been made to solve such a problem, and is intended to prevent a computer with a television output terminal having a copy protection function from hindering the expandability of a computer and to output an image while preventing illegal copying. It is an object of the present invention to obtain a duplication preventing apparatus, a duplication preventing method, and a program for executing duplication prevention for preventing duplication. Disclosure of the invention

The present invention relates to a DVD video playback means for determining whether or not a medium to be played back is a DVD video when the DVD video is played back by a DVD video playback application in a computer having a video output terminal; If it is determined that the media to be played is DVD video by the means, And a setting change unit for setting the video output setting of the video output terminal to FF. In the present specification, the processing by the DVD video judging means is performed by the CPU using application software, and the processing by the setting changing means is also performed by the system controller changing the register of the VGA controller in accordance with an instruction from the CPU. It is done in.

Further, in the present invention, the DVD video determination means determines that the video is DVD video when the compression method of the medium to be reproduced is MPEG2 and the overlay is 640 pixels × 480 pixels or more. It is characterized by determining. MPEG2 is one of the video compression formats and is used for DVD and digital broadcasting. By the determination according to the present invention, a DVD can be reliably distinguished from a video CD or the like in MPEG1 format or image data for a portable terminal in MPEG4 format. Furthermore, VHS video does not have a screen size standard, and video CD has 240 pixels x 180 pixels, but DVD screen size standard has 720 pixels X 480 pixels or 720 pixels X 576 pixels. Based on a small size of 720 pixels x 480 pixels, this is converted to a 4: 3 format, and the minimum data size is the minimum. You can distinguish DVD from other media.

The present invention also provides a computer with a video output

When playing back with the VD video playback application, determine whether the media to be played back is DVD video, and if it is DVD video, turn off the video output setting of the video output terminal on the computer. And a method for preventing duplication.

The present invention also provides a computer with a video output

When playing back with the VD video playback application, determine whether the media to be played back is DVD video, and if it is DVD video, turn off the video output setting of the video output terminal on the computer. This is to provide a program that executes the processing to be performed. BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a block diagram schematically illustrating the principle of the present invention.

FIG. 2 is a block diagram illustrating the structure of the VGA controller shown in FIG.

FIG. 3 is a flowchart illustrating the duplication preventing operation of the present invention in detail. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in more detail.

FIG. 1 is a block diagram simply illustrating the principle of the present invention, and shows a personal computer main body and peripheral devices connected to the personal computer main body. The PC 10 is composed of a CPU 11, a system controller 12 for controlling the PC system, a liquid crystal display (LCD) 13 provided on the PC, a VGA controller 14, which is a graphics adapter, It has a PC I / I SA bus bridge 15 and a DVD-ROM drive 16, all of which are connected by a PCI bus or ISA path. Further, the personal computer 10 is provided with a television output terminal 18 and a CRT output terminal controlled by the VGA controller 14. Note that the TV output terminal 18 includes a composite S terminal and the like.

The TV output terminal 18 is connected to the video input terminal 21 of the VCR 20 so that images can flow from the personal computer to the VCR 20. Further, a video output terminal 22 provided on the video deck 20 is connected to a video input terminal 24 of a commercial television 23 so that an image flows from the video deck 20 to the commercial television 23.

Note that the DVD-ROM drive 16 shown in the figure is a drive that is later added to the personal computer 10, and the specifications of the personal computer 10 consider the connection of the DVD-ROM drive during the basic design. It is assumed that the DVD does not have a hardware duplication prevention function. The DVD-ROM drive 16 reproduces DVD using application software for DVD reproduction.

Here, the copy prevention processing of the present invention will be briefly described. If you start the application software for DVD playback and try to play a DVD whose copying is normally prohibited, first, the CPU 11 determines whether the media to be played is a DVD or not. The determination is made using application software for DVD playback. In the case of DVD, the system controller 12 changes the register of the VGA controller 14 according to an instruction from the CPU 11 so that the output setting of the TV output terminal 18 is set to OFF. With this processing, DVD video cannot be output from the TV output terminal, so copying can be prevented even on a personal computer that does not have a copy protection function. Next, with reference to FIG. 2 and FIG. 3, a detailed operation of the anti-duplication processing of the present invention will be described.

FIG. 2 is a block diagram illustrating the structure of the VGA controller 14 shown in FIG.

The VGA controller 14 has a host bus interface 30, an interface to the PCI bus, a memory controller / interface 34, and a D / A converter for CRT as shown in the figure. It is equipped with a CRT.D AC42, an LCD engine 43 for outputting to LCD, and a TV engine 44 for outputting to TV, and a drawing coprocessor 31 to control graphics processing, and a VGA. Graphics controller 32, video 1 interface 33, first display controller 35, second display controller 36, first palette 38 for first graphics data 37, second palette 38 for second graphics data 39 It has various functions, such as 40, pack-end video and stream 41. The TV engine 44 is a controller for controlling the output of the TV output terminal 18. The ON / OFF of the video output can be changed by changing the register of the TV engine 44.

FIG. 3 is a flowchart illustrating a detailed operation related to the copy protection process of the present invention. Insert the DVD video disc 17 into the DVD-ROM drive 16 and start the DVD video playback application (S100). The CPU accesses the DVD-ROM drive using the DVD video playback application (S101), and determines the type of the medium in the DVD-ROM drive based on the content of the application (S102).

First, it is determined whether or not the compression format of the reproduction medium is MPEG2 (S103). If it is not MPEG2 (S103, NO), the CPU 11 Judgment is not D, and the copy protection processing is not performed, and the DCD 13 and the CRT monitor connected to the CRT output terminal 19 are displayed at the ratio of the screen size recorded on the DVD video disc 17 A playback display window is displayed (S108). Then, DVD playback is started by the DVD video playback application (S109).

In S104, if the playback medium is MPEG2 (S103, YE S), then the DVD playback application records the information on the DVD video disk 17 to the VAG driver. The information of a certain picture size is read, and an overlay is instructed (S104). Here, if the overlay is less than 640 pixels X 480 pixels (S105, YE S), the CPU 11 determines that the playback medium is not a DVD, and does not perform the copy protection processing, but executes S1 as described above. 08 and S109 are performed. If the overlay is smaller than 640 pixels X 480 pixels (S105, NO), the CPU 11 determines that the playback medium is a DVD, recognizes that the playback medium is a DVD, and performs TV protection as copy prevention processing. Change the register to turn off the output (S106). Specifically, the system controller 12 rewrites the register of the VGA controller 14 according to an instruction from the CPU 11. The register is included in the TV engine 44, and by changing the register so that the TV output becomes OFF, the video output from the TV output terminal 18 is not performed (S107). At the stage where the duplication prevention processing is completed in this way, the processing of S108 and S109 is performed in the same manner as described above.

Normally, when playing back a DVD that cannot be copied normally when the PC has a TV output terminal, the Macrovision standard uses a Macrovision standard TV that includes a duplication prevention signal in the playback video. It must be an output signal, but this is not possible with a PC that does not have a copy protection function in terms of hardware. However, stopping the television output automatically as described above solves the problem of copy protection. By performing such processing, it is possible to play DVDs with playback software in any environment with the performance of a computer.

The duplication preventing apparatus according to the present invention provides a computer having a video output When a D-video is played back by a DVD-video playback application, a DVD-video determination unit that determines whether the media to be played back is a DVD video, and a media to be played back by the DVD video playback determination unit is determined to be a DVD video. In such a case, the computer is provided with a setting change unit that sets the video output setting of the video output terminal of the computer to OFF, so that even a device having no copy protection function can prevent DVD-Video copying. .

If the DVD video judging means judges that the DVD is a DVD video when the compression method of the medium to be reproduced is MPEG2 and the overlay is 640 pixels X 480 pixels or more, the video CD And video compression or video compression using other compression methods. DVD video can be automatically identified by an easy method without any additional hardware, and duplication is prevented. be able to.

Further, the duplication preventing method according to the present invention is characterized in that, in a computer with a video output terminal, when a DVD video is reproduced by a DVD video reproducing application, it is determined whether or not the medium to be reproduced is a DVD video and the DVD video is reproduced. Since the video output setting of the video output terminal in the computer is turned off, the duplication can be prevented more easily and reliably than the conventional duplication preventing method.

In addition, the program according to the present invention is provided for determining whether or not a medium to be played back is a DVD video when the DVD video is played back by a DVD video playback application in a computer having a video output terminal. Executes the process of turning off the video output setting of the video output terminal in the computer, so that this program can be easily installed on the target device without any additional hardware, Can be prevented from being duplicated.

Claims

The scope of the claims

1. In a computer having a video output terminal, when a DVD video is played back by a DVD video playback application, a DVD video determination means for determining whether or not a medium to be played is a DVD video, and the DVD video playback determination means A copy changing device for setting a video output setting of the video output terminal of the computer to OFF when it is determined that the media to be reproduced is DVD video.

2. The DVD video judging means judges that the video is DVD video when the compression method of the medium to be reproduced is MPEG2 and the overlay is 640 pixels X 480 pixels or more. 2. The duplication prevention device according to item 1.

3. On a computer with a video output terminal, when playing a DVD video with a DVD video playback application, determine whether the medium to be played is a DVD video or not, and if the media is a DVD video, play the video on the computer. A duplication prevention method characterized by turning off the video output setting of the output terminal.

4. When a DVD video is played back by a DVD video playback application on a computer with a video output terminal, it is determined whether or not the medium to be played is a DVD video. A program that executes processing to set the video output setting of the terminal to OFF.