Changing OPL-options allowed?

[Wouter Vanden Hove]

Hi, 

During my ongoing search of free licenses in all kinds of documentation,
I've come across a PostNuke Guide at
http://www.drewvogel.com/modules.php?op=modload&name=Downloads&file=index&req=getit&lid=5


On the first page is stated:
------------------------------------
"LICENSE & COPYRIGHT FOR THIS GUIDE
The Official PostNuke Installation and Getting started Guide was written
by Drew Vogel. Copyright 2002 by Drzew Vogel. All rights reserved.

You may not distribute, modify, or translate this Guide without prior
consent of Drew Vogel (drew at drewvogel.com). The only approved use is
review,comment, and personal use.

This material may be distributed only subject to the terms and
conditions set forth in the Open Publication License, Draf v.1.0, 5 Juni
1999 or later (the latest version is available at
http://www.opencontent.org/openpub ).

Distribution and/or sale of substantively modified versions of this
document is prohibited without the explicit permission of the copyright
holder.

Distribution and/or sale of the work or derivative of the work in any
standard (paper) book form or printed form is prohibited unless prior
permission is obtained from the copyright holder."
----------------------------------------------------------------


Appearantly, this guide is dual licensed with a traditional license and
the OPL with options A and B. So the first statements do not contradict
the terms of the OPL with options. Correct?

But when you compare these options with options A and B of the OPL, you
see that they are changed:

"Distribution" ---> "Distribution AND/OR SALE"   (2X)

"any standard (paper) book form"  ---> 
                  "any standard (paper) book form OR PRINTED FORM"


Are such changes allowed? 
Of course, a copyright holder chooses whatever he wishes, but if he
chooses OPL+options, can he then change the options to more restrictive
ones?


 
Wouter Vanden Hove