So then I can remove the current copyright?

Should I release the source like the demo is released, with the #error
directives in?

> Oh, come on, don't be so complicated.  It clearly says:
>
> " EXCLUSION FROM STANDARD LICENCE PROVISIONS
>
>  Software authors may use this source code in derived programs PROVIDED
>  thay they comply with the terms of POVEXT.TXT."
>
> And in POVEXT.TXT it says:
>
> "Extensions may be based on the 'extension toolkit' source code we
provide.
> That is, we explicitly permit you to re-use our demonstration source code
> (and in fact encourage it, since it helps ensure that you comply with our
> standards.) This permission DOES NOT extend to other POV-Ray source
files."
>
> So if you comply with it, you may use this source code.  Very easy, isn't
> it?  The source code is copyrighted and provided to you under the given
> license.  Obviously you have to refer to the given license when making it
> available.  But the changed source code remains your copyrighted program,
of
> course.
>
>     Thorsten

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