Change the CONTRIBUTING to use Developer's Certificate of Origin 1.1

(cherry picked from commit 845eb2ebbc0f07fd9588ba844e61d09afd4165e4)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f78595aa41552e961aab383ae6b656117d152e67..e0770dc3407cc33ffacc7a5011eb8b1379cba899 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -112,12 +112,46 @@ BIND is licensed under the
 Earlier versions (BIND 9.10 and earlier) were licensed under the
 [ISC License](https://www.isc.org/licenses/)
 
-ISC does not require an explicit copyright assignment for patch
-contributions.  However, by submitting a patch to ISC, you implicitly
-certify that you are the author of the code, that you intend to relinquish
-exclusive copyright, and that you grant permission to publish your work
-under the open source license used for the BIND version(s) to which your
-patch will be applied.
+ISC does not require an explicit copyright assignment for patch contributions.
+However, with the modern open source movement, it is very easy to contribute
+patches and people often don't think about the legal implications. Is the code
+you're about to contribute really yours? If you work for a company and you
+developed it during your work hours, it's likely to be owned by the company you
+work for. Are they OK with you contributing this? Are they OK with the fact that
+this will be open source and other users and companies, even possibly a
+competitor, may use it?
+
+BIND 9 adopted [Developer Certificate of Origin](https://developercertificate.org/),
+which is a nice half a page document by Linux foundation. By contributing your patch,
+you confirm that you follow and agree with the following:
+
+```
+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.
+```
 
 #### <a name="bind"></a>BIND code