License question

I just got a question originating from our lawyers at work, concerning
the usage of 'free software' in our product.

The product (currently) consists of a modified Redhat 7.1 distribution,
PostgreSQL 7.1.3 (in custom RPM packages) and some proprietary softwares.

I read the license, and saw this paragraph:
       use, copy, modify, and distribute this software and its       documentation for any purpose, without fee, and
without      a written agreement is hereby granted
 

We're charging for the SYSTEM (ie, hardware and software combination)
which contains and have PostgreSQL as a fundamental part of the whole
system and function.

We're not charging SPECIFICALLY for PostgreSQL, but for a complete, working
setup... Is this in conformance with the PostgreSQL license...?


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