diff --git a/debian/control b/debian/control
--- a/debian/control
+++ b/debian/control
@@ -7,8 +7,9 @@
                python3-all,
                python3-aiohttp,
                python3-arrow,
-               python3-flask,
                python3-dateutil,
+               python3-decorator,
+               python3-flask,
                python3-msgpack,
                python3-pytest,
                python3-psycopg2,
@@ -16,8 +17,8 @@
                python3-requests-mock,
                python3-setuptools,
                python3-systemd,
+               python3-vcversioner,
                python3-yaml,
-               python3-vcversioner
 Standards-Version: 3.9.6
 Homepage: https://forge.softwareheritage.org/diffusion/DCORE/
 
diff --git a/debian/copyright b/debian/copyright
--- a/debian/copyright
+++ b/debian/copyright
@@ -1,5 +1,10 @@
 Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 
+Files: swh/core/api/negotiate.py
+Copyright: 2012-2013, Nick Stenning
+           2019 Software Heritage
+License: MIT
+
 Files: *
 Copyright: 2015 The Software Heritage developers
 License: GPL-3+
@@ -20,3 +25,22 @@
  .
  On Debian systems, the complete text of the GNU General Public
  License version 3 can be found in `/usr/share/common-licenses/GPL-3'.
+
+License: MIT
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+ .
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+ .
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.