[Oberon] Attribution of graphics.

[peter at easthope.ca]

Obvious questionable point under Licensing in
https://commons.wikimedia.org/wiki/File:OberonMouse1.jpg .
"Copyright (c) 1990-2003" is from the ETH Oberon license.

At the bottom of http://www.projectoberon.com the copyright range is 
1987-2021.

So the commons page should be corrected to 1987-2021?

I've always wondered about an upper limit on copyright.  Before the 
Web, a paper book could state Copyright 1927 and that was the year 
when the book appeared in stores.  If a knock-off was printed in 1929, 
it was in violation.  The original didn't have to claim 1927-1929. 

The arrow isn't changing.  The copyright on the arrow, belonging to 
Professors Wirth and Gutknecht, continues indefinitely? 

Thx,                              ... P.L.