https://github.com/SELinuxProject/selinux-artwork
SELinux is flexible Mandatory Access Control (MAC) mechanism for Linux, this repository contains all of the official artwork used by the project.
When submitting changes to the artwork you need to provide a sign-off for your work. The sign-off is a simple line at the end of the patch description, which certifies that the work is your own or you otherwise have the right to pass it on as an open-source patch. The "Developer's Certificate of Origin" pledge is taken from the Linux Kernel and the rules are pretty simple:
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.
... then you just add a line to the bottom of your patch description, with your real name, saying:
Signed-off-by: Random J Developer <random@developer.example.org>
Patches can be submitted via GitHub pull requests (PRs).