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copyright

 
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This isn't a question necessarily about java but I wasn't sure where else to go with it. I'm wondering what the conventions are about using someone else's code. The code I want to use is copyrighted and I would not be using it for my own profit - purely educational. Is it okay for me to use it and if so how would I go about citing it? The code I'm interested in using can be found at http://www.cs.princeton.edu/introcs/96optimization/Knapsack.java.
 
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Whether you're using it for profit has nothing to do with infringement.

The best thing to do is contact the copyright owners and ask permission. For this code, the owners appear to be listed at the bottom of this page.

On the other hand, this code looks very fundamental. See Copyright Registration for Computer Programs (Circular 61 from the United States Copyright Office), which states, "Copyright protection is not available for ideas, program logic, algorithms, systems, methods, concepts, or layouts."
 
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I concurr, if any question - just ask. This is classroom exercise, likely, and I am sure they would not mind if you learn from it. They would likely be complimented to have someone ask to use this for educational reasons.

The general principle, qualified by the circular cited, is ideas cannot be bound by the glacial pace of law: But if someone thought of something and wanted to let it get away unbounded ... they will so state in comments to be found somewhere in the distribution.
 
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