non standard PDF? [was: Re: Ubuntu's not GNU/Linux?]

[Matthias Kirschner]

* Theo Schmidt <theo.schmidt at wilhelmtux.ch> [2010-04-20 09:01:28 +0200]:

> How about this one:
> http://www.skppsc.ch/1/downloads/de/Betrugspraevention_www.den-trick-kenne-ich.ch.pdf
> 
> I'm not able to open this with any of my PDF readers, not even xpdf. It doesn't 
> appear to be DRMed, just somehow prgrammed not to open without the required 
> Adobe reader. My usual trick of using pdf2ps doesn't work either, it is the 
> first PDF I've not been able to view without resorting to Adobe reader. Or am I 
> doing something wrong?

Does it use some proprietary extensions?
http://pdfreaders.org/os.en.html

Best wishes,
Matthias

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