This is the Debian GNU/Linux prepackaged version of the deferred execution scheduler called at. This package was debianized by its author Thomas Koenig , taken over and re-packaged first by Martin Schulze and then by Siggy Brentrup , and then taken over by Ryan Murray . In August 2009 the upstream development and Debian packaging were taken over by Ansgar Burchardt and Cyril Brulebois . This may be considered the experimental upstream source, and since there doesn't seem to be any other upstream source, the only upstream source. Copyright: 1993, 1994, 1995, 1996, 1997 (c) Thomas Koenig 1993 (c) David Parsons 2002, 2005 (c) Ryan Murray This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. The files posixtm.c and posixtm.h have the following copyright information: Copyright (C) 1989, 1990, 1991, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. On Debian GNU/Linux systems, the complete text of the GNU General Public License can be found in `/usr/share/common-licenses/GPL'.