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It is frequently argued in the open source and free software community that making source code available to all is good for security. A large community of users and experts can pore over the code and vulnerabilities.
Closed system are infinitely preferable since the ability for attackers to gain access to the source code to identify potential vulnerabilities is substantially decreased.
Open systems preferable since it allows for a broad analysis of the source code, enabling defects, bugs and potential security holes to be identified quickly, the patches to be generated and the affected entities to be informed.
In a perfect world, and for systems large and complex enough for statistical methods to apply, the attack and the defense are helped equally. Whether systems are open or closed makes no difference in the long run.
There is really no right answer except number one. Each has its merits and it depends upon which side of the fence you sit upon
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