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  2. Secure Digital Music Initiative - Wikipedia

    en.wikipedia.org/wiki/Secure_Digital_Music...

    The letter invited hackers, cryptologists and others to detect and remove the watermark from some example pieces of music. Several groups became involved, including a group led by Ed Felten. Felten's group claimed to have cracked the scheme and successfully removed the watermark according to the automated judging software supplied by the SDMI.

  3. Digital rights management - Wikipedia

    en.wikipedia.org/wiki/Digital_rights_management

    Also included may be the file's publisher, author, creation date, download date, and various notes. This information is not embedded in the content, as a watermark is. It is kept separate from the content, but within the file or stream. As an example, metadata is used in media purchased from iTunes for DRM-free as well as DRM-restricted content.

  4. Printer tracking dots - Wikipedia

    en.wikipedia.org/wiki/Printer_tracking_dots

    Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...

  5. File:Gyegustreetscene Gruschke.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Gyegustreetscene...

    The usage of visible watermarks is discouraged. If a non-watermarked version of the image is available, please upload it under the same file name and then remove this template . Ensure that removed information is present in the image description page and replace this template with {{Metadata from image}} or {{Attribution metadata from licensed ...

  6. Digital watermarking - Wikipedia

    en.wikipedia.org/wiki/Digital_watermarking

    A digital watermark is called semi-fragile if it resists benign transformations, but fails detection after malignant transformations. Semi-fragile watermarks commonly are used to detect malignant transformations. A digital watermark is called robust if it resists a designated class of transformations. Robust watermarks may be used in copy ...

  7. Security paper - Wikipedia

    en.wikipedia.org/wiki/Security_paper

    Barack Obama's birth certificate on security paper.. Security paper is a paper used in security printing that incorporates features that can be used to identify or authenticate a document as original, e.g., watermarks or invisible fibres in paper, or features that demonstrate tamper evidence when fraud is attempted, e.g., to remove or alter print such as amounts or signatures on a cheque.

  8. EURion constellation - Wikipedia

    en.wikipedia.org/wiki/EURion_constellation

    The EURion constellation is made up of five rings. The EURion constellation (also known as Omron rings [1] or doughnuts [2]) is a pattern of symbols incorporated into a number of secure documents such as banknotes, cheques, and ownership title certificate designs worldwide since about 1996.

  9. Copy detection pattern - Wikipedia

    en.wikipedia.org/wiki/Copy_detection_pattern

    Digital watermarks may be used as well to differentiate original prints from counterfeits. [ 26 ] [ 27 ] A digital watermark may also be inserted into a 2D barcode. [ 28 ] The fundamental difference between digital watermarks and CDPs is that a digital watermark must be embedded into an existing image while respecting a fidelity constraint ...

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