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/usr/share/doc/dupload/CREDITS is in dupload 2.7.0ubuntu1.

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Heiko Schlittermann <heiko@lotte.sax.de> wrote it and maintained it
during the heroic times.

Julian Gilbey <J.D.Gilbey@qmw.ac.uk> made many patches and code 
cleanings.

Brian Almeida <bma@debian.org> made the code to automatically detect
changelog 1.6.