Copyrights

[Bill Denney]

What is the correct thing to do for copyrighted files in the octave 
directory?  I know that things that I create are
Copyright (C) <year> Bill Denney,
but what about things that I modify?

Should I do something like (if I modified the plot.m file)
Copyright (C) 1996, 1997 John W. Eaton, 2005 Bill Denney

I want all my work submitted to Octave to be GPL'd, but in case of 
problems like the license issues that caused problems with XFree86, I want 
to keep the copyright to my files and changes myself.  (I don't anticipate 
such problems, but neither did the Xorg people.)

Sorry if this has been answered somewhere else.

Bill

--
"We're a gang, a real fierce gang, and we are into design.  We know what 
the consumer needs and we know without calling a line."
  -- The Joeys