[docbook-css] Licence Clarification

[martin.gautier@myrnham.co.uk]

<br><font size=2 face="sans-serif">David</font>
<br>
<br><font size=2 face="sans-serif">In principle I'm happy with both.</font>
<br>
<br><font size=2 face="sans-serif">Is it possible to ensure that the whole
product remains in the Public Domain and the license can't be revoked at
a later stage/version?</font>
<br>
<br><font size=2 face="sans-serif">I was recently close to a situation
where a friend had contributed content and fixes to an open source solution
over a period of years only to find that one day, the &quot;owner&quot;
had pulled the code &quot;in-house&quot; and started charging for the product
- ie. this guy had contributed code for free to a product that he now had
to buy to use...</font>
<br>
<br><font size=2 face="sans-serif">The DocBook DTD has this license text:</font>
<br>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;Permission to
use, copy, modify and distribute the DocBook XML DTD</i></font>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;and its accompanying
documentation for any purpose and without fee</i></font>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;is hereby granted
in perpetuity, provided that the above copyright</i></font>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;notice and this
paragraph appear in all copies. &nbsp;The copyright</i></font>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;holders make
no representation about the suitability of the DTD for</i></font>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;any purpose.
&nbsp;It is provided &quot;as is&quot; without expressed or implied</i></font>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;warranty.</i></font>
<br>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;If you modify
the DocBook XML DTD in any way, except for declaring and</i></font>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;referencing additional
sets of general entities and declaring</i></font>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;additional notations,
label your DTD as a variant of DocBook. &nbsp;See</i></font>
<br><font size=2 face="sans-serif"><i>&nbsp; &nbsp; &nbsp;the maintenance
documentation for more information.</i></font>
<br>
<br><font size=2 face="sans-serif">I guess the key bit is &quot;...granted
in perpetuity...&quot;?</font>
<br>
<br><font size=2 face="sans-serif">Mart</font>