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# Contributing

Contributions are welcome.

Contributions can be done via GitLab merge request or via patches (`git send-email` or `git format-patch`) sent to slepc-maint@upv.es. The preferred way of accepting contributions is via merge requests, as described at PETSc Developer’s Documentation. If you are planning a large contribution, we encourage you to discuss the concept with us and interact frequently to ensure that your effort is well-directed. The name of the contributors will be acknowledged in SLEPc’s documentation and website.

SLEPc is distributed under a 2-clause BSD license. The act of submitting a pull request or patch (with or without an explicit Signed-off-by tag) will be understood as an affirmation of the following:

> Developer’s Certificate of Origin 1.1

> By making a contribution to this project, I certify that:

> (a) The contribution was created in whole or in part by me and I have the right to submit it under the open source license indicated in the file; or

> (b) The contribution is based upon previous work that, to the best of my knowledge, is covered under an appropriate open source license and I have the right under that license to submit that work with modifications, whether created in whole or in part by me, under the same open source license (unless I am permitted to submit under a different license), as indicated in the file; or

> (c) The contribution was provided directly to me by some other person who certified (a), (b) or (c) and I have not modified it.

> (d) I understand and agree that this project and the contribution are public and that a record of the contribution (including all personal information I submit with it, including my sign-off) is maintained indefinitely and may be redistributed consistent with this project or the open source license(s) involved.