Do not yourself, or let one of your developers pull from open source code resources unless you want your app to be open source itself.
Top 10 things developers MUST know about IP before launching an app
Dropsource
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This isn’t necessary. What is necessary is to know which licenses are problematic. It is not always a lot of fun, but it saves a lot of wasteful rework on the dev side. The IP lawyer that you engage with should be able to provide some general guidelines for licenses based on the architecture of the app.

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