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Recently I stumbled upon a free php script and found it very useful. I customized it, rewrote markup almost completely, added custom js scripts, added new core features, removed unnecessary features and stuff, basically I changed more than 50% of original work. There is no license included in original package, no license or terms of use information provided on the site, nothing. I was wondering if I am allowed to sell that highly-modified version?

Thanks in advance.

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If you have the right to sell it than yes :)

Ask the original author for the license. Even if you change 95% of the code 5% is from another person and you can’t sell it without permission

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The answer to your question is, if the use is transformative than it’s fair use, if not get permission (a license). The percentage used (no more than necessary) is a factor in determining fair use.

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