This is Huffyuv v2.1.1, by Ben Rudiak-Gould. (If the archive you downloaded has an older version number, it's because you followed an outdated link.) This source code is Copyright 2000 Ben Rudiak-Gould. It is distributed under the terms of the GNU General Public License, version 2 or later. You should have received a copy of the GPL along with this source code; if not, see http://www.gnu.org/copyleft/gpl.html or the Huffyuv home page, http://www.math.berkeley.edu/~benrg/huffyuv.html . I have tested this code only under Visual C++ 6.0. If you find this source code useful or you have problems, please let me know! My email address is benrg@math.berkeley.edu.