The '''Trusted Data Format''' ('''TDF''') is an [[XML]] based [[file format]] developedused by the [[United States Intelligence Community]] for the purposes of enabling file level tagging and security features.<ref name="DNI">http://www.dni.gov/index.php/about/organization/chief-information-officer/trusted-data-format</ref> These features include [[Logical assertion|assertion]] of data properties or tags, [[Electronic signature|cryptographic binding]] and [[encryption|data encryption]]. The TDF is [[Open-source software|open source]] and requires no use of proprietary or patented technology and is thus free for anyone to use.
