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Is jQuery a GPL?
You are still free to take a jQuery Foundation project, make changes, and re-license it under the GPL if your situation makes that desirable. The Free Software Foundation site confirms that the MIT License is a “lax, permissive non-copyleft free software license, compatible with the GNU GPL.”
Is DataTables open source?
DataTables 1.10 and newer is available under the terms MIT license. This places almost no restrictions on what you can do with DataTables, and you are free to use it in any way (including commercial projects), as long as the copyright header is left intact.
Can a GPL license invalidate a license?
This License gives no permission to license the work in any other way, but it does not invalidate such permission if you have separately received it. So if GPL-licensed code ever gets included in your project, for example via linking against a GPL’d library, you must also provide your whole project under the GPL.
Can you use a GPL library with a different license?
If you want to avoid these problems then you need to use things with a different license or at the very least the LGPL which will allow run-time calling of libraries without the viral-spread of the GPL conditions back to your code. When in doubt you need legal advice.
When does your software need to be covered by the GPL?
If you release/distribute software containing GPL’d components (such as statically linked libraries), your software must be covered by the GPL. (This is the impression given for version 2; version 3 may be different.)
Is it legal to use GPL code in a proprietary, closed?
An “original work” that uses code from another source is in fact a derivative work of both the original work and the other source, and it is the derivative work that is required to be licensed under the GPL. The original work remains under whatever licence it had before.