TIFF/EP is the Tag Image File Format/Electronic Photography standard, which describes an image file format. This format is a subclass of the TIFF standard that adds multiple features, including a "SecurityClassification" tag.
The "SecurityClassification" tag semantically classifies the document (image) as being of a particular information sensitivity. The value of the tag is based on the National Imagery Transmission Format (NITF) which follows the classification values defined in MIL-STD-2500. The value of the tag is a single character ASCII value T,S,C,R,U which represents "Top Secret", "Secret", "Classified", "Restricted", or "Unclassified", respectively. tepsniff looks only for this tag.
- NITF - https://en.wikipedia.org/wiki/National_Imagery_Transmission_Format
- TIFF - https://en.wikipedia.org/wiki/TIFF
- TIFF/EP - http://www.digitalpreservation.gov/formats/content/tiff_tags.shtml
- MIL-STD-2500C - http://www.gwg.nga.mil/ntb/baseline/docs/2500c/2500C.pdf
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