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I am working on a proprietary java application. I want to use a java library licensed LGPL 2.1. One condition of the license is to disclose source code. What does it exactly mean? Do I need to disclose the source code of my full application?

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    Yes; the purpose the LGPL is to allow you to combine the LGPL code with code from another license. The code of your own can be licensed in whatever way you choose, so you don't need to release your own source code. All of your questions are probably already answered here and by reading the LGPL if you need more details: How can LGPL and proprietary licenses be combined?. If you are still confused please expand your question to explain what is still unclear. – Brandin Jan 10 at 8:07
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    Possible duplicate of How can LGPL and proprietary licenses be combined? – MadHatter Jan 10 at 13:31
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Yes, if the LGPL-covered JAR is linked in a way so that users are free to modify it, then you don't have to disclose your own source code. You do need to publish the source code for the library though, see the license for options.

The easiest way to comply is if you provide the source code of the LGPL-covered JAR alongside the JAR file. Also, you should not prevent the JAR from being changed by users, so it would be best not to sign the JAR file.

Note also that the GPL and LGPL only trigger their requirements when you give someone else a copy of (L)GPL covered software. These licenses do not impose any requirements on software that you use purely internally, or if the software provides services to others but is only executed on your servers. So for a Java Servlet or for an internall app you wouldn't have to do anything, but you would have to follow the license for an app or program that you make available to other businesses or people.

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