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On 18/09/2015 13:41, Jondy Zhao wrote:
[...]
> In reality, when we leave the house, we lock the door, even the lock could
> not make sure the safe of our property. It's just make it difficult.
> It's same in the software world. Someone need the lock in both of the world.

I think you meant "in the *proprietary* software world".

This discussion on the topic, and in particular this answer, on 
Stackoverflow are quite inspiring:

http://stackoverflow.com/questions/261638/how-do-i-protect-python-code/261727#261727

Lorenzo.