> I am not sure about the licensing, so here are my questions:

Your questions would be best answered by reading the license :-) It's 
available at http://www.mozilla.org/MPL/ . We're happy to give you 
advice on what we (and most other people) think it means if you like.


> 1. Under what conditions can we distribute the SpiderMonkey
> library together with our commercial application.


This is exactly what the license document sets out, and it's the best 
source.

> 2. Do we have to publish our new application under e.g. MPL or
> GPL license in case we use the SpiderMonkey?


No. Section 3.7 (and others.)

> 3. Can we sell the software (in case we use the SpiderMonkey
> library) without any restriction related to MPL/NPL/GPL?
> We want to charge our customers for the whole application.


Yes.

> 4. Do we have to enclose also the source code of the SpiderMonkey
> to our application?


Not necessarily. See section 3.6.

> 5. Do we have to mention somewhere we use the SpiderMonkey library?
> Where? Is a splash screen enough?


Yes, you probably do. Section 3.3.

Gerv


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