Copyright & License Questions

[TARuiz at aol.com]

Hi,

I'm new to these open source issues. So the following questions may be quite 
naive:

1)  I've read that one should copyright their work and from there choose an 
Open Source license. Isn't copyrighting, though, against the concept of Open 
Source?

2) If I were to assign a copyright, is it a matter of simply placing a notice 
of authorship and year? Is that enough in terms of a legal standpoint?

3) When I choice an Open Source license or a hybrid of some sort, does one 
just simply revise/copy a template of an existing license or just write a new 
one and insert this along with the software?  

4) Basically are there any legal stamps that make the copyright and chosen 
licenses enforceable? And, what makes them legitimate to the community?

5) Does anyone know, other than Sun & MS, current examples of hybrid models?

6) If I wanted to provide proprietary modules/add-ons to the Open Source 
software, what license would enable me to do so?

7) If I had a client who hired me to do a customized and closed-version of 
the Open Source software, what license would enable me to do so?

I'll stop there...As you can see, I have lots of questions. Any help would be 
appreciated.  Many thanks!!

Best,
Tomas
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