licensing
Verifying authenticity of software for proprietary licensing
<p>What happens when I include parts of code(maybe logic/algo, design approach and change its implementation or implement it in a different programming language) of an open-source copy left software  in my software and try to make it proprietary? So how will proprietary license issuing authorities verify authenticity of my software(code)? I will claim it as my original work and will never acknowledge that I built it by referencing an open-source work.</p>

<p>What “proprietary license issuing authorities”? There is no such thing.</p>
<p>You sell your software for money with a proprietary license. Someone suspects you copied someone else’s code and tells the copyright holder. The copyright holder can be nice and ask you to stop selling under a proprietary license, tell all your customers that your software is under an open source license, and/or pay them money.</p>
<p>Or they take you straight to court. You <em>will</em> be forced to show the evidence (your source code) to their lawyers, they will find the evidence, and sue you for the maximum damages.</p>
<p>BTW Making false claims in court is a <em>serious</em> crime, like lying that you never copied any one’s code.</p>
