Content Sealed Format (DRM) (CSF) is a proprietary format created by the Informative Graphics Corporation[1] for sharing electronic documents, images and CAD drawings in an encrypted format with embedded protection to permit visual operations on the files, such as time expiration, ability to print, copy, measure, view by layers, etc. It is also known as "Visual Rights".
PDF is an abbreviation with several meanings: Portable Document Format Post-doctoral fellowship Probability density function There also is an electronic design automation company named PDF Solutions. ...
External Links
Informative Graphics' "Visual Rights" Digital Rights Management
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