"Graphical interface to the digital investigation tools in The Sleuth Kit. Together, they allow you to investigate the file system and volumes of a computer."
"Evidence from the Electronic Frontier Foundation is that the encodings are embedded in color printers from all major manufacturers. (...) most manufacturers do nothing to make consumers aware that their printouts can be tracked."
EFF campaign agains printer manufacturers using yellow dots to secretly watermark color prints probably suitable for tracking documents.