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Bootstrap is released under the Apache 2 license. Boiled down to smaller chunks, it can be described with the following conditions.
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It allows you to:
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+ - Freely download and use Twitter open source software, in whole or in part, for personal, company internal or commercial purposes
+ - Use Twitter open source software in packages or distributions that you create
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It forbids you to:
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+ - Redistribute any piece of Twitter open source originated software without proper attribution
+ - Use any marks owned by Twitter in any way that might state or imply that Twitter endorses your distribution
+ - Use any marks owned by Twitter in any way that might state or imply that you created the Twitter software in question
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It requires you to:
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+ - Include a copy of the license in any redistribution you may make that includes Twitter software
+ - Provide clear attribution to Twitter for any distributions that include Twitter open source software
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It does not require you to:
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+ - Include the source of the Twitter software itself, or of any modifications you may have made to it, in any redistribution you may assemble that includes it
+ - Submit changes that you make to the software back to Twitter (though such feedback is encouraged)
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The full Bootstrap license is located in the project repository for more information.
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