Update COPYRIGHT/README

COPYRIGHT

@@ -1,5 +1,6 @@
 # Copyright
 
-Due to the use of copyrighted material in posters and slides, the presentations 
-in this repository may be cited but not re-used.
+Due to the use of copyrighted material in posters and slides, 
+the contents of this repository may be cited but not re-used 
+without permission.
 

README.md

@@ -6,5 +6,6 @@ like Posters and Talks from past conferences and workshops.
 Please refer to the Copyright file for details.
 
 Due to the use of copyrighted material in posters and slides, 
-the presentations in this repository may be cited but not re-used.
+the contents of this repository may be cited but not re-used 
+without permission.