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I am trying to do outside projects during college as part of self-learning, and trying to boost my resume/portfolio for internships. Recently I taught myself how to modify the temple run apk to give myself unlimited coins, but in doing so i had to resign the apk with my own certificate.

If i wanted to post this online, and possibly write up a blog post about it, would it be legal? I assume it would be legal if i just wanted to talk about it and how i did it, but is posting the file okay too?

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It depends. If the app is open-source, it's fine as long as you follow the license (typical requirements: credit original authors, release your code under the same license). –  Mechanical snail Jan 11 '13 at 6:34
    
If not, you can post a patch. However, if what you do actually works around access restrictions, the DMCA forbids sharing it (U.S. law). –  Mechanical snail Jan 11 '13 at 6:36
    
Ah thank you for your fast reply. I guess I will just talk about it in a blog post then. Is it illegal that the app gives you free coins, since the only other two ways to earn coins are by playing the game or buying them? –  Glen Takahashi Jan 11 '13 at 6:37
    
Not sure. The relevant provision is the en.wikipedia.org/wiki/Anti-circumvention one. –  Mechanical snail Jan 11 '13 at 6:40
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closed as off topic by Indrek, KronoS, Diogo, 8088, haimg Jan 11 '13 at 18:08

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Unlikely. It will depend on whether or not the author has licensed it with a license that allows distribution of derivative works (e.g. the GPL, or a Creative Commons license). If it doesn't say so on the apps page, then you should assume not, and contact the author for permission.

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