We became accustomed to acquiring software by procuring licenses for a proprietary, immaterial object. However, in recent years, this habit has begun to be accompanied by a model characterized by software that comes with a compilable source code. This is "open source software."
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Why not studying also the time needed to patch a vulnerability (if eventually got patched) under the two developing models?
The shorter the time between disclosure and patch and the smaller the probability that the bug might be maliciously exploited...
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