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If I want to make a card game app or android, could I legally borrow parts of the Apache-2.0-licensed Solitaire-for-Android? Would I be able to charge such a project? (I was unable to understand the legal jargon in the license here.)

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yes you can. but you cant do back to them nor can anyone drag them to court if something you sold does not work or has other issues – tgkprog Apr 26 '13 at 0:55
Are you asking if you can change something and sell copies? You can do that for any open source (as defined by the OSI) license, although it works better as a revenue stream with the least restrictive licenses. – David Thornley Apr 26 '13 at 17:39
up vote 4 down vote accepted

It's actually a very simple license, worth reading with due respect. If you can ask the question in English, I'm very sure you can comprehend the license - just try once again, without distractions.

In short, you can (section 3) IF you follow the rules (section 4 through 9). If you don't follow, then you are in violation.

Disclaimer: I'm not a lawyer and in your shoes, I'd get a legal opinion instead of a random dude online.

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