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Watermark. A watermark is an identifying image or pattern in paper that appears as various shades of lightness/darkness when viewed by transmitted light (or when viewed by reflected light, atop a dark background), caused by thickness or density variations in the paper. [1] Watermarks have been used on postage stamps, currency, and other ...
Digital watermarking. A digital watermark is a kind of marker covertly embedded in a noise-tolerant signal such as audio, video or image data. [1] It is typically used to identify ownership of the copyright of such a signal. "Watermarking" is the process of hiding digital information in a carrier signal; the hidden information should, [2] but ...
Digital rights management ( DRM) is the management of legal access to digital content. Various tools or technological protection measures (TPM), [1] such as access control technologies, can restrict the use of proprietary hardware and copyrighted works. [2] DRM technologies govern the use, modification and distribution of copyrighted works (e.g ...
Google Chrome: convert HTML to PDF using Print > Save as PDF. gDoc Fusion: Proprietary, shareware; PDF views, edits, converts documents into PDF, XPS or Microsoft Word document; after 30 days a watermark is placed on documents in shareware version; OmniPage: Converts to and from PDF and other formats with many options.
Audio watermark. An audio watermark is a unique electronic identifier embedded in an audio signal, typically used to identify ownership of copyright. It is similar to a watermark on a photograph. Digital watermarking is the process of embedding information into a signal (e.g. audio, video or pictures) in a way that is difficult to remove.
Watermark (data file) Appearance. hide. A watermark stored in a data file refers to a method for ensuring data integrity which combines aspects of data hashing and digital watermarking. Both are useful for tamper detection, though each has its own advantages and disadvantages.