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Suppose you have top level Dependency A.

Dependency A is licensed under MIT.

Dependency A packages Dependency B as part of its distribution.

Dependency B is licensed under GPL.

In order to use Dependency A, do you need to agree to the terms of both MIT as well as GPL, or just MIT.

  • Does A depend on B (you can't use A without B), or are the two just distributed together for convenience? – Bart van Ingen Schenau Jun 29 '16 at 6:54
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    A Depends on B. – dardo Jun 29 '16 at 12:18
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The GPL license is written in such a way that you are not allowed to use GPL-licensed code in a product unless the users of the product have the same rights that are granted by applying the GPL license. This is even the case if only a small portion of the complete product is actually licensed under the GPL.
Due to this "infectious" nature of the GPL, if you indirectly/transitively depend on some code that is licensed under the GPL, then you are also required to release your project under a license that is compatible with the GPL.

So, if you want to use Dependency A (MIT licensed), which in turn depends on Dependency B (GPL licensed), then your code must be licensed in a way that is compatible with the terms of the GPL, which essentially means that you have to use an open-source license.

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