CONTRIBUTING: Document our expectation of DCO

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

2 files changed, 44 insertions, 0 deletions

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 87bdfb2..9ebaf1a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -78,6 +78,16 @@ get there in the best possible way. You should tell the story of
 flying by plane to get somewhere, not how you explored the world and
 eventually invented flying machines to travel faster.
 
+**Sign off your commits:** The commits in a merge request must each
+individually carry a `Signed-off-by` footer.  This footer should
+identify the entity which has checked the commit and confirmed that
+it is acceptable for it to be contributed to the Subplot project.
+
+The Subplot project requires that each contribution to it meets
+the assertions listed in the Developer Certificate of Origin version
+1.1 (the text of which can be found in `DCO-1-1.txt` alongside this
+document).
+
 # Definition of done
 
 When a change is made to Subplot, it must meet the following minimum
diff --git a/DCO-1-1.txt b/DCO-1-1.txt
new file mode 100644
index 0000000..49b8cb0
--- /dev/null
+++ b/DCO-1-1.txt
@@ -0,0 +1,34 @@
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+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.