Deployment of PostgreSQL Applications

Hi everyone,

I'm working on a (sorry) closed source application which consists of Java 
servlets, beans, and client applications talking to a postgresql database.  
Now, lets say I'm interested in bundling this all together and selling it to 
customers.

2 questions:

1) Is it legal to bundle Postgresql with another commercial application, 
assuming the database will have to be significantly reconfigured and tuned? 
(at the application level, not the source code level)  I read over the 
licenses I could find on the site and they seemed to imply that the answer 
was yes, but I'd like to reaffirm that.

2) More importantly, is it possible to prevent a customer from peeking into 
said database once it is deployed on their machine?  A large part of what 
makes my application proprietary is the data model in the database, and it'd 
be tough to maintain a competative edge when everyone can see exactly how I 
do things in the database by logging into their postgres account, adding 
some users and changing permissions on their machine.  I really need to make 
sure the database is bulletproof before I can begin deployment.

I' very new to postgresql and unix system administration in general, never 
having secured a system or played with permissions much in the past.  Any 
advice would be greatly appreciated.

Thanks,
Mike

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