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Parsing output = derivative work? (was: RFS: gnetworktester)

(out of curiosity moved to debian-legal)

On 2011-03-05 23:46, Timo Juhani Lindfors wrote:
> gnetworktester seems to parse the output of nmap and nmap upstream at
> http://insecure.org/nmap/data/COPYING gives me the impression that
> gnetworktester would thus be "derivative work".

IANAL, but since when parsing the output of another program
constitutes a derivative work? Indeed, the forementioned file
says, a program would be a derivate in the authors
interpretation of the GPL, if it

 o Executes Nmap and parses the results (as opposed to typical shell or
   execution-menu apps, which simply display raw Nmap output and so are
   not derivative works.)
 o Integrates/includes/aggregates Nmap into a proprietary executable
   installer, such as those produced by InstallShield.
 o Links to a library or executes a program that does any of the above

What do the legal experts think about this, especially the
parsing aspect?

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