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See ContributionGuidelines for guidelines submissions must adhere to. That page also describes the general process for how a patch/contribution gets accepted into DSpace. The mechanics of creating a patch file are described in Guide to Developing with DSpace.

Copyright and Licensing of Code

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Contributions

In the words of the PostgreSQL Global Development Group, which also uses the BSD license, "The simplest explanation of the licensing terms is that you can do whatever you want with the product and source code as long as you don't claim you wrote it or sue us." The BSD License under which DSpace is made available does not require you to make your changes public or open-source. It does allow for proprietary commercial use, and for DSpace-derived creations to be incorporated into proprietary commercial products. Works based on DSpace may even be released under a proprietary license (but still must maintain the license requirements).

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