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In the fields of physical security and information security, the high-water mark for access control was introduced by Clark Weissman in 1969. [1] It pre-dates the Bell–LaPadula security model, whose first volume appeared in 1972.
It is a shaded watermark first used in 1848 that incorporates tonal depth and creates a greyscale image. Instead of using a wire covering for the dandy roll, the shaded watermark is created by areas of relief on the roll's own surface. Once dry, the paper may then be rolled again to produce a watermark of even thickness but with varying density.
The information to be embedded in a signal is called a digital watermark, although in some contexts the phrase digital watermark means the difference between the watermarked signal and the cover signal. The signal where the watermark is to be embedded is called the host signal. A watermarking system is usually divided into three distinct steps ...
Audio watermark, techniques for embedding hidden information into audio signals; Watermark (data file), a method for ensuring data integrity which combines aspects of data hashing and digital watermarking; Watermark (data synchronization), directory synchronization related programming terminology; Watermarking attack, an attack on disk ...
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Reading the format on other systems can be difficult or impossible. Antiword was created to support reading this format on these systems. Using the plain text output of Antiword, a Word document can be processed and filtered using shell scripts traditional text tools such as diff and grep. [1] It can also be used to filter Word document spam. [2]
After 30 days a watermark is placed on documents in shareware version. LibreOffice: Free (Mozilla Public License) an Office suite; allows to export (and import, with accuracy limitations) PDF files. Microsoft Word 2013: Proprietary: Desktop software. The 2013 edition of Office allows PDF files to be converted into a format that can be edited ...
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