PDFTeX (formerly known as TeX2PDF) arose from Han The Thanh's post-graduate research at Masaryk University, Brno, Czech Republic. The basic idea is very simple: to provide a version of TeX that can output PDF as an alternative format to DVI. PDFTeX implements a small number of new primitives, to switch to PDF output, and to control various PDF features. Han The Thanh is continuing work on the project; the latest version is available from systems/pdftex, and a version was distributed on the TeX Live CD-ROM (see TeX CD-ROMs).