What obligations do we have if we use GPL-licensed software?

質問

We are using software libraries licensed under the GPL v2 to develop our own server applications. We do not sell nor otherwise distribute any software, but our online service is used by clients all over the world. The software that we developed based on the GPL-licensed libraries, do we need to provide the source code or are their any other obligations for free software of this kind? I am wondering if our software is independent enough to be considered original, not a derivative work of the free software.

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