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Yes, it restricts you from integrating with proprietary software (and some others). Here is a breakdown of license compatibility:

https://en.m.wikipedia.org/wiki/License_compatibility

Note that more permissive licenses (MIT/BSD) allow more freedom for the developer.

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The GPL doesn't restrict integration with proprietary code. It requires any code you choose to integrate it with to be similarly licensed. That is the same choice you have every time you create code.

So, it doesn't restrict, it just requires you to choose GPL? That is a double plus good interpretation of the facts.

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