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moron4hire is correct.

If you are not distributing the software personally or outside your organization, the GPL does not apply to you. If what you are doing does not constitute a derivative work, then your software is also not affected by the GPL: if you're invoking GNU grep in your program, for example, your program does not need to be licensed under a GPL-compatible license.

For clarification, see https://www.gnu.org/licenses/gpl-faq.html

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I am aware of these issues. I replied in-haste in-class, and didn't specify that I was only referring to library code. I instead used 'work', which was the wrong term; I apologize. Anyway, according to the GPL, using a GPL-ed library as a dependency in a larger codebase constitutes a derivative work (assuming distribution etc), thus requiring GPL-ing the whole larger codebase, which isn't cool (imo, of course).

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