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There is a nice Apache 2.0-licensed project that already implements the foundation of a way more elaborate product that I intend to sell as proprietary.

Something like the 70% of the code will be modified or rewritten, so it's not really like I'm including it as a module or library.

Unfortunately I cannot release the sources of the final product as OSS, but it is possible to add credits and acknowledgements.

Would this be legal?

marked as duplicate by unor, Mans Gunnarsson, Zimm i48, curiousdannii, Community Apr 15 '17 at 9:43

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First, a caveat. If this is critical, you should consult a lawyer and explain exactly what you're doing - this answer isn't legal advice.

What you're describing is allowed under the Apache license. You will still need to comply with the conditions such as providing attribution and including a copy of the license. The best source of information is the license itself; however, the Apache Foundation does provide a nice summary in its FAQs here: https://www.apache.org/foundation/license-faq.html#WhatDoesItMEAN

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