debian/copyright verbosity

[Matthias Julius <lists@julius-net.net>]

In the light of the recent discussion about debian/copyright on -devel
I am wondering how verbose it actually needs to be.  Given the
following files:

 Files: foo.c
 Copyright: 2006 Mr. X
 License: GPL2+

 Files: bar.c
 Copyright: 2008 Mr. X
 License: GPL2+

 Files: baz.c
 Copyright: 2005 Mr. Y
 License: GPL2+

This would be the most explicit form preserving the exact copyrights
for each file.  Would it be acceptable to condense this to:

 Files: foo.c
        bar.c
 Copyright: 2006, 2008 Mr. X
 License: GPL2+

 Files: baz.c
 Copyright: 2005 Mr. Y
 License: GPL2+

or even further to:

 Files: *.c
 Copyright: 2006, 2008 Mr. X
 Copyright: 2005 Mr. Y
 License: GPL2+

especially for files under (L)GPL?

Matthias