jQuery, jQuery UI, and Dual Licensed Plugins (Dual Licensing)

Posted by John Hartsock on Stack Overflow See other posts from Stack Overflow or by John Hartsock
Published on 2010-05-03T13:38:50Z Indexed on 2010/05/06 10:08 UTC
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OK I have read many posts regarding Dual Licensing using MIT and GPL licenses. But Im curious still, as the wording seems to be inclusive. Many of the Dual Licenses state that the software is licensed using "MIT AND GPL". The "AND" is what confuses me.

It seems to me that the word "AND" in the terms, means you will be licensing the product using both licenses. Most of the posts, here on stackoverflow, state that you can license the software using one "OR" the other.

JQuery specifically states "OR", whereas JQuery UI specifically States "AND". Another Instance of the "AND" would be JQGrid.

Im not a lawyer but, it seems to me that a legal interpretation of this would state that use of the software would mean that your using the software under both licenses. Has anyone who has contacted a lawyer gotten clarification or a definitive answer as to what is true? Can you use Dual licensed software products that state "AND" in the terms of agreement under either license?

EDITED: Guys here is specifically what Im talking about on jquery.org/license you see the following stated:

You may use any jQuery project under the terms of either the MIT License or the GNU General Public License (GPL) Version 2

but in the header of Jquery's and Jquery UI library you see this:

 * Dual licensed under the MIT and GPL licenses.
 * http://docs.jquery.com/License

The site says

MIT or GPL

but the license statement in the software says

MIT and GPL.

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