---
breadcrumbs:
- - /chromium-os
  - Chromium OS
- - /chromium-os/chromiumos-design-docs
  - Design Documents
- - /chromium-os/chromiumos-design-docs/chromium-os-kernel
  - Kernel Design
page_name: dco
title: Documented Certificate of Ownership
---

The DCO is the standard release for Linux kernel code, and is required to submit
all Linux kernel code upstream, and hence to Google.

> `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; and`
> ` (d) In the case of each of (a), (b), or (c), 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 indicated in the file.`