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[Richard Kenner]

> If you really want to do it:
> 
> 1) create a wrapper to asterisk -r
> 2) pipe the welcome message to /dev/null
> 3) ???
> 4) profit
> 
> you didn't modify Asterisk.

No you didn't, but you may neverthess have created a derived work.  There
are two different legal arguments you can make when two pieces of software
are tightly coupled in that way: one argues that it's a derived work and
the other that it's not.

Copyright law when it comes to software is not simple and certainly
not obvious.  If you want to use a piece of Free Software in a commercial
product, you need to consult an attorney.  It's really that simple.