We've chosen to use the Developer's Certificate of Origin (DCO) method that is employed by the Linux Kernel Project, which provides a simple way to contribute to MindPoint Group projects.
The process is to certify the below DCO 1.1 text
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, when it comes time to submit a contribution, include the following text in your contribution commit message:
Signed-off-by: Joan Doe <joan.doe@email.com>
This message can be entered manually, or if you have configured git with the correct user.name and user.email, you can use the -s option to git commit to automatically include the signoff message.