Dual-Licensing Situation

[AR]

Arnoud Engelfriet wrote:
> . . .
>> Correct, and he has granted me the right to run the program without 
>> restriction and the right to accept the license without additional 
>> conditions.
>>     
>
> Well, there are no restrictions imposed upon your usage of the GPLv2
> software. They also don't impose conditions on your usage or distribution
> of the software. So what's the problem?
>
> They only say "once you start using the GPL software, we won't sell
> a proprietary license anymore".

Which is effectually adding terms to the original GPL license, because 
the original GPL license did not say that.

> . . .