Echizen Laboratory National Institute of Informatics (NII)

　

Department of Information and Communication Engineering,
Graduate School of Information Science and Technology, The University of Tokyo

　

Department of Informatics, School of Multidisciplinary Sciences,
The Graduate University For Advanced Studies (SOKENDAI)

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Security technologies for overcoming analog-hole problem

Technology to prevent unauthorized copying of screens | Technology to prevent unauthorized copying of displays

Technology to prevent unauthorized copying of screens (collaboration with the Kogakuin University)

　We developed a technology that prevents unauthorized copying of films shown on a screen. This technology utilizes the differences in spectral sensitivity characteristics between human beings and imaging devices. By installing a near-infrared-ray light source, which superimposes noise on video images without affecting human vision, on the back of existing movie screens, unauthorized copying of the images shown on the screen can be prevented without adding any new functions to digital cameras.

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Technology to prevent unauthorized copying of displays (collaboration with the Kogakuin University)

　We have also developed a new technology by applying this technology to the unauthorized copying of displays. In a similar manner, this technology facilitates copyright protection for picture and image content and prevents disclosure of confidential and personal information through the unauthorized copying of displays by simply equipping existing displays with a unit to prevent unauthorized copying, without adding any new functions to digital cameras. In addition to preventing disclosure of confidential and personal information through the unauthorized copying of displays, an issue that is becoming more important, it is expected that this new technology will have broad application for preventing unauthorized photographing of works of art, factory equipment, and other objects subject to photographic restrictions.


Interference effect on unauthorized copying of images (17-inch LCD, Left: without noise, right: with noise)

Reference

  1. NII Press Release, “Technology to prevent unauthorized copying of displays by utilizing differences in sensitivity between human beings and devices - Prevent disclosure of confidential and personal information through unauthorized copying of displays,” July 4, 2011
  2. NII Interview: Preventing Surreptitious Filming in the Divide Between Digital and Physical, NII Today, No. 51, pp. 2-3 (February 2011)
  3. T. Yamada, S. Gohshi, and I. Echizen, “iCabinet: Stand-alone implementation of a method for preventing illegal recording of displayed content by adding invisible noise signals,” Proc. of the ACM Multimedia 2011 (ACM MM 2011), pp. 771-772 (November 2011)
  4. T. Yamada, S. Gohshi, and I. Echizen, “Countermeasure of re-recording prevention against attack with short wavelength pass filter,” Proc. of the 2011 IEEE 18th International Conference on Image Processing (ICIP2011), pp. 2753-2756 (September 2011)
  5. T. Yamada, S. Gohshi, and I. Echizen, “Re-shooting prevention based on difference between sensory perceptions of humans and devices,” Proc. of the 17th International Conference on Image Processing (ICIP 2010), pp.993-996 (September 2010)