Does modified Open Source code HAS-TO-BE open-sourced?

If you're not going to distribute it, you can do what you want with it.

If you're not going to distribute it, you can do what you want with it. See this entry in the GPL FAQ.

– Sumit Ghosh Sep 13 '09 at 14:46 @Sumit: No, I don't believe that counts as distribution. As ever, however, I'm not a lawyer. – Jon Skeet Sep 13 '09 at 20:24.

Adding to Jon's answer, if you distribute it in any way, the GPL license is deliberately viral, so you'd have to provide source to the entire application with the distribution.

Short answer: if it's GPL, you have to: give the source code of all the application to the client only (but he can redistribute it to whoever he wants after that) if the client asks for it.

As others have stated, you will only need to give the source to people you have given the binary to (and then only if they ask for it). So, if the binary is only used within the company, you don't need to hand the soure out to anyone but employees (if they ask for the source). You cannot, however, restrict someone from passing the source (or the application) on, but I cannot answer if any company confidentialy agreement would trump or be trumped by the GPL.

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