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    <p>To be 100% sure, you should read <a href="http://www.gnu.org/licenses/gpl-faq.html" rel="noreferrer">FAQ</a> and then contact a lawyer who is familiar with software licensing. Don't talk to the lawyers who aren't because they'll tell you not to use anything free/opensource just to be on the safe side, which anyone can say.</p> <p>Anyway, what do you mean by "data source which is GPL"? Is GPL source code being linked into your application?</p> <p>There are several questions in the FAQ regarding plug-in and GPL. </p> <blockquote> <p><strong>Can I release a non-free program that's designed to load a GPL-covered plug-in?</strong></p> <p>It depends on how the program invokes its plug-ins. For instance, if the program uses only simple fork and exec to invoke and communicate with plug-ins, then the plug-ins are separate programs, so the license of the plug-in makes no requirements about the main program. </p> <p>If the program dynamically links plug-ins, and they make function calls to each other and share data structures, we believe they form a single program, which must be treated as an extension of both the main program and the plug-ins. In order to use the GPL-covered plug-ins, the main program must be released under the GPL or a GPL-compatible free software license, and that the terms of the GPL must be followed when the main program is distributed for use with these plug-ins.</p> <p>If the program dynamically links plug-ins, but the communication between them is limited to invoking the ‘main’ function of the plug-in with some options and waiting for it to return, that is a borderline case.</p> <p>Using shared memory to communicate with complex data structures is pretty much equivalent to dynamic linking.</p> </blockquote> <p>As others have pointed out, web apps that are not distributed seems to be considered private use under plain GPL (not in Affero GPL?).</p> <blockquote> <p><strong>A company is running a modified version of a GPL'ed program on a web site. Does the GPL say they must release their modified sources?</strong></p> <p>The GPL permits anyone to make a modified version and use it without ever distributing it to others. What this company is doing is a special case of that. Therefore, the company does not have to release the modified sources.</p> <p>It is essential for people to have the freedom to make modifications and use them privately, without ever publishing those modifications. However, putting the program on a server machine for the public to talk to is hardly “private” use, so it would be legitimate to require release of the source code in that special case. Developers who wish to address this might want to use the GNU Affero GPL for programs designed for network server use.</p> </blockquote>
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    1. POLGPL/GPL licensing
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    1. USEugene Yokota
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    1. COI suppose that when you don't distribute the GPL datasource (JDBC driver, perhaps?) with your application, and the customer downloads the GPL datasource on his own and configures the application to use it, it would be considered private use on the part of the customer so noone of you would have to release the source to anything. The side effect would be a minor inconvenience for the customer (he must get the GPL stuff separately from the original creator and put all this together). Please, note that IANAL (I Am Not A Lawyer) so this is not official legal advice. Consult a competent person.
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      1. USAleksander Adamowski
    2. COThe question asked about LGPL, not GPL which this comment is talking about, i would downvote, but don't want to waste my points.
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    3. CO@Amala OP wrote "This library uses a data source which is GPL."
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      1. USEugene Yokota
 

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