If I (or a company where I work) use a source code part from an open source project licensed under a permissive license like MIT or Apache 2.0 it is clear I can modify, edit etc it.
What is not clear for me, is it mandatory to have the resulting product also under a permissive open source license?
If it is not mandatory, how it differs from "do whatever you want", I mean except, the expectation to show the original license when distributing?
Say the company dodoes not distribute it at all, just uses it in modified form as a part internal commercial production process, say banking industry?