2013/2/18 Johan Vervloet <johan.vervloet@gmail.com>
We have 4 programmers. All programmers have contributed to the code. Most source files contain sources contributed by more than 1 programmer. What should we do with the copyright notice?

To answer my own question: This article of the sflc turned out to be very informative:
 http://softwarefreedom.org/resources/2012/ManagingCopyrightInformation.html

Johan