--- title: Developer Certificate of Origin description: Enforce the DCO on Pull Requests slug: dco screenshots: - https://cloud.githubusercontent.com/assets/173/24482273/a35dc23e-14b5-11e7-9371-fd241873e2c3.png stars: 28 authors: - bkeepers repository: probot/dco updated: 2017-10-19 15:02:50 UTC host: https://probot-dco.herokuapp.com installations: 66 organizations: - hyperledger - jaegertracing - envoyproxy - phpmyadmin - WeblateOrg - coreinfrastructure - redhat-developer - mainflux - jbosstools - mdeguzis --- The Developer Certificate of Origin (DCO) is a lightweight way for contributors to certify that they wrote or otherwise have the right to submit the code they are contributing to the project. Here is the full [text of the DCO](https://developercertificate.org/), reformatted for readability: > By making a contribution to this project, I certify that: > > 1. 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 > > 2. 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 > > 3. The contribution was provided directly to me by some other person who certified (a), (b) or (c) and I have not modified it. > > 4. 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. Contributors _sign-off_ that they adhere to these requirements by adding a `Signed-off-by` line to commit messages. ``` This is my commit message Signed-off-by: Random J Developer ``` Git even has a `-s` command line option to append this automatically to your commit message: ``` $ git commit -s -m 'This is my commit message' ``` Once installed, this app will set the [status](https://developer.github.com/v3/repos/statuses/) to `failed` if commits in a Pull Request do not contain a valid `Signed-off-by` line.