Can I sell my product?

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You should always consult a lawyer to answer legal questions.

Here are some related questions from Arduino FAQs:

I have used Arduino for my project, do I need to release my source code? – Arduino Help Center

Since Arduino uses Creative Commons licenses, do I also need to do that on my product? – Arduino Help Center

I have designed a product that has an Arduino board as its core. Do I have to make my product open source? – Arduino Help Center