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I have built a framework that has the core modules: module1, module2, module3, module4.
But I have also build module5 that uses the core modules and also derives classes from the module1. I want module5 to make it proprietary and sell it as binaries and keep the the ownership of the code for module5. The rest of the 4 core modules can be open source.
Can this be done with Mozilla Public License? Or is there a better license for what I want?
This can surely be done with the MPL license. At a high level, the MPL is a weak, limited copyleft where the copyleft applies on a per-file basis.
The specific section that would allow your use case is "3.3. Distribution of a Larger Work":
You may create and distribute a Larger Work under terms of Your choice, provided that You also comply with the requirements of this License for the Covered Software.
