diff --git a/gnu/packages/android.scm b/gnu/packages/android.scm
index 99c283dfaf..0a551c7d30 100644
--- a/gnu/packages/android.scm
+++ b/gnu/packages/android.scm
@@ -4,12 +4,11 @@
 ;;; Copyright © 2016, 2020 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2017 Julien Lepiller <julien@lepiller.eu>
 ;;; Copyright © 2017 Hartmut Goebel <h.goebel@crazy-compilers.com>
-;;; Copyright © 2017 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+;;; Copyright © 2017, 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2018, 2019, 2020 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2018 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2019, 2020 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2019 Ricardo Wurmus <rekado@elephly.net>
-;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2020 Sergey Trofimov <sarg@sarg.org.ru>
 ;;;
 ;;; This file is part of GNU Guix.
diff --git a/gnu/packages/code.scm b/gnu/packages/code.scm
index 04b354b71e..7551b31e85 100644
--- a/gnu/packages/code.scm
+++ b/gnu/packages/code.scm
@@ -1,6 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013, 2015, 2018, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
-;;; Copyright © 2015 Andreas Enge <andreas@enge.fr>
+;;; Copyright © 2013, 2015 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2015, 2018 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2016, 2017, 2019, 2020, 2021 Efraim Flashner <
efraim@flashner.co.il>
 ;;; Copyright © 2017, 2018, 2019, 2020 Tobias Geerinckx-Rice <me@tobias.gr>
@@ -9,7 +9,6 @@
 ;;; Copyright © 2018 Fis Trivial <ybbs.daans@hotmail.com>
 ;;; Copyright © 2018 Pierre Neidhardt <mail@ambrevar.xyz>
 ;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
-;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2014 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2019 Hartmut Goebel <h.goebel@goebel-consult.de>
 ;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
diff --git a/gnu/packages/cpp.scm b/gnu/packages/cpp.scm
index f4708eda91..4af71ba93a 100644
--- a/gnu/packages/cpp.scm
+++ b/gnu/packages/cpp.scm
@@ -6,7 +6,7 @@
 ;;; Copyright © 2019, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
 ;;; Copyright © 2019 Pierre Neidhardt <mail@ambrevar.xyz>
 ;;; Copyright © 2019 Jan Wielkiewicz <tona_kosmicznego_smiecia@interia.pl>
-;;; Copyright © 2020 Nicolò Balzarotti <nicolo@nixo.xyz>
+;;; Copyright © 2020, 2021 Nicolò Balzarotti <nicolo@nixo.xyz>
 ;;; Copyright © 2020 Roel Janssen <roel@gnu.org>
 ;;; Copyright © 2020 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2020 Brice Waegeneire <brice@waegenei.re>
@@ -18,7 +18,6 @@
 ;;; Copyright © 2020 Brett Gilio <brettg@gnu.org>
 ;;; Copyright © 2020 Milkey Mouse <milkeymouse@meme.institute>
 ;;; Copyright © 2021 Raghav Gururajan <rg@raghavgururajan.name>
-;;; Copyright © 2021 Nicolò Balzarotti <nicolo@nixo.xyz>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
diff --git a/gnu/packages/databases.scm b/gnu/packages/databases.scm
index a27fd637eb..b519aa91fb 100644
--- a/gnu/packages/databases.scm
+++ b/gnu/packages/databases.scm
@@ -27,7 +27,7 @@
 ;;; Copyright © 2017, 2018 Alex Vong <alexvong1995@gmail.com>
 ;;; Copyright © 2017, 2018 Ben Woodcroft <donttrustben@gmail.com>
 ;;; Copyright © 2017 Rutger Helling <rhelling@mykolab.com>
-;;; Copyright © 2017, 2018 Pierre Langlois <pierre.langlois@gmx.com>
+;;; Copyright © 2017, 2018, 2019 Pierre Langlois <pierre.langlois@gmx.com>
 ;;; Copyright © 2015, 2017, 2018, 2019, 2021 Ricardo Wurmus <
rekado@elephly.net>
 ;;; Copyright © 2017 Kristofer Buffington <kristoferbuffington@gmail.com>
 ;;; Copyright © 2018 Amirouche Boubekki <amirouche@hypermove.net>
@@ -36,7 +36,6 @@
 ;;; Copyright © 2019 Jack Hill <jackhill@jackhill.us>
 ;;; Copyright © 2019 Alex Griffin <a@ajgrf.com>
 ;;; Copyright © 2019 Gábor Boskovits <boskovits@gmail.com>
-;;; Copyright © 2019 Pierre Langlois <pierre.langlois@gmx.com>
 ;;; Copyright © 2019, 2021 Guillaume Le Vaillant <glv@posteo.net>
 ;;; Copyright © 2020 Pierre Neidhardt <mail@ambrevar.xyz>
 ;;; Copyright © 2020, 2021 Nicolò Balzarotti <nicolo@nixo.xyz>
diff --git a/gnu/packages/emacs-xyz.scm b/gnu/packages/emacs-xyz.scm
index 05d10bc4ae..2754ce7049 100644
--- a/gnu/packages/emacs-xyz.scm
+++ b/gnu/packages/emacs-xyz.scm
@@ -74,7 +74,6 @@
 ;;; Copyright © 2020 Ryan Desfosses <rdes@protonmail.com>
 ;;; Copyright © 2020 Marcin Karpezo <sirmacik@wioo.waw.pl>
 ;;; Copyright © 2020 Fredrik Salomonsson <plattfot@gmail.com>
-;;; Copyright © 2020 Ryan Desfosses <rdes@protonmail.com>
 ;;; Copyright © 2020 Eric Bavier <bavier@posteo.net>
 ;;; Copyright © 2020, 2021 Morgan Smith <Morgan.J.Smith@outlook.com>
 ;;; Copyright © 2020 Peng Mei Yu <i@pengmeiyu.com>
diff --git a/gnu/packages/file.scm b/gnu/packages/file.scm
index 3f1145b520..f811ba77c7 100644
--- a/gnu/packages/file.scm
+++ b/gnu/packages/file.scm
@@ -1,9 +1,8 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
 ;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
-;;; Copyright © 2016, 2017 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2016, 2017, 2018 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
-;;; Copyright © 2018 Efraim Flashner <efraim@flashner.co.il>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
diff --git a/gnu/packages/freedesktop.scm b/gnu/packages/freedesktop.scm
index bc47ddb0d1..514125977b 100644
--- a/gnu/packages/freedesktop.scm
+++ b/gnu/packages/freedesktop.scm
@@ -11,7 +11,7 @@
 ;;; Copyright © 2017, 2018 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2017, 2018, 2019, 2020 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2017, 2018, 2019 Rutger Helling <rhelling@mykolab.com>
-;;; Copyright © 2017, 2020 Brendan Tildesley <mail@brendan.scot>
+;;; Copyright © 2017, 2020, 2021 Brendan Tildesley <mail@brendan.scot>
 ;;; Copyright © 2018, 2020, 2021 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2018 Pierre Neidhardt <mail@ambrevar.xyz>
 ;;; Copyright © 2018 Stefan Stefanović <stefanx2ovic@gmail.com>
@@ -22,7 +22,6 @@
 ;;; Copyright © 2020 Nicolò Balzarotti <nicolo@nixo.xyz>
 ;;; Copyright © 2020 Anders Thuné <asse.97@gmail.com>
 ;;; Copyright © 2020 Raghav Gururajan <raghavgururajan@disroot.org>
-;;; Copyright © 2021 Brendan Tildesley <mail@brendan.scot>
 ;;; Copyright © 2021 pineapples <guixuser6392@protonmail.com>
 ;;; Copyright © 2021 Robby Zambito <contact@robbyzambito.me>
 ;;;
diff --git a/gnu/packages/gl.scm b/gnu/packages/gl.scm
index f6b9232e0a..a417e363bb 100644
--- a/gnu/packages/gl.scm
+++ b/gnu/packages/gl.scm
@@ -5,7 +5,6 @@
 ;;; Copyright © 2014, 2015, 2016, 2017 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2016 Nikita <nikita@n0.is>
 ;;; Copyright © 2016, 2017, 2018, 2020, 2021 Ricardo Wurmus <
rekado@elephly.net>
-;;; Copyright © 2016 David Thompson <davet@gnu.org>
 ;;; Copyright © 2017, 2018, 2019, 2021 Efraim Flashner <
efraim@flashner.co.il>
 ;;; Copyright © 2017 Arun Isaac <arunisaac@systemreboot.net>
 ;;; Copyright © 2017, 2018, 2019 Rutger Helling <rhelling@mykolab.com>
diff --git a/gnu/packages/gps.scm b/gnu/packages/gps.scm
index 7a5b1eb118..03bff15760 100644
--- a/gnu/packages/gps.scm
+++ b/gnu/packages/gps.scm
@@ -7,7 +7,6 @@
 ;;; Copyright © 2020 Vincent Legoll <vincent.legoll@gmail.com>
 ;;; Copyright © 2020 Marius Bakke <marius@gnu.org>
 ;;; Copyright © 2021 Björn Höfling <bjoern.hoefling@bjoernhoefling.de>
-;;; Copyright © 2021 Efraim Flashner <efraim@flashner.co.il>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
diff --git a/gnu/packages/linux.scm b/gnu/packages/linux.scm
index 63141da3ab..2836a01d49 100644
--- a/gnu/packages/linux.scm
+++ b/gnu/packages/linux.scm
@@ -30,12 +30,11 @@
 ;;; Copyright © 2018 Pierre-Antoine Rouby <pierre-antoine.rouby@inria.fr>
 ;;; Copyright © 2018, 2020 Brendan Tildesley <mail@brendan.scot>
 ;;; Copyright © 2018 Manuel Graf <graf@init.at>
-;;; Copyright © 2018 Pierre Langlois <pierre.langlois@gmx.com>
+;;; Copyright © 2018, 2019 Pierre Langlois <pierre.langlois@gmx.com>
 ;;; Copyright © 2018 Vasile Dumitrascu <va511e@yahoo.com>
 ;;; Copyright © 2019 Tim Gesthuizen <tim.gesthuizen@yahoo.de>
 ;;; Copyright © 2019, 2020, 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com
>
 ;;; Copyright © 2019 Stefan Stefanović <stefanx2ovic@gmail.com>
-;;; Copyright © 2019 Pierre Langlois <pierre.langlois@gmx.com>
 ;;; Copyright © 2019, 2020, 2021 Brice Waegeneire <brice@waegenei.re>
 ;;; Copyright © 2019 Kei Kebreau <kkebreau@posteo.net>
 ;;; Copyright © 2020, 2021 Oleg Pykhalov <go.wigust@gmail.com>
diff --git a/gnu/packages/networking.scm b/gnu/packages/networking.scm
index 3655a3dac7..c6788e8d86 100644
--- a/gnu/packages/networking.scm
+++ b/gnu/packages/networking.scm
@@ -20,7 +20,7 @@
 ;;; Copyright © 2017 Thomas Danckaert <post@thomasdanckaert.be>
 ;;; Copyright © 2018 Adam Van Ymeren <adam@vany.ca>
 ;;; Copyright © 2018 Fis Trivial <ybbs.daans@hotmail.com>
-;;; Copyright © 2018 Tonton <tonton@riseup.net>
+;;; Copyright © 2018, 2019 Tonton <tonton@riseup.net>
 ;;; Copyright © 2018 Clément Lassieur <clement@lassieur.org>
 ;;; Copyright © 2018 Theodoros Foradis <theodoros@foradis.org>
 ;;; Copyright © 2018, 2020, 2021 Marius Bakke <marius@gnu.org>
@@ -31,7 +31,6 @@
 ;;; Copyright © 2019 Julien Lepiller <julien@lepiller.eu>
 ;;; Copyright © 2019 Timotej Lazar <timotej.lazar@araneo.si>
 ;;; Copyright © 2019, 2020, 2021 Brice Waegeneire <brice@waegenei.re>
-;;; Copyright © 2019 Tonton <tonton@riseup.net>
 ;;; Copyright © 2019, 2020 Alex Griffin <a@ajgrf.com>
 ;;; Copyright © 2019, 2020 Jan Wielkiewicz <
tona_kosmicznego_smiecia@interia.pl>
 ;;; Copyright © 2019 Daniel Schaefer <git@danielschaefer.me>
diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 257c1f9266..d35cc2378f 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -42,7 +42,6 @@
 ;;; Copyright © 2017, 2020, 2021 Roel Janssen <roel@gnu.org>
 ;;; Copyright © 2017, 2018, 2019 Kei Kebreau <kkebreau@posteo.net>
 ;;; Copyright © 2017 Rutger Helling <rhelling@mykolab.com>
-;;; Copyright © 2017 Muriithi Frederick Muriuki <fredmanglis@gmail.com>
 ;;; Copyright © 2017, 2019, 2021 Brendan Tildesley <mail@brendan.scot>
 ;;; Copyright © 2018 Ethan R. Jones <ethanrjones97@gmail.com
 ;;; Copyright © 2018 Fis Trivial <ybbs.daans@hotmail.com>
@@ -72,9 +71,8 @@
 ;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
 ;;; Copyright © 2020 sirgazil <sirgazil@zoho.com>
 ;;; Copyright © 2020 Sebastian Schott <sschott@mailbox.org>
-;;; Copyright © 2020 Alexandros Theodotou <alex@zrythm.org>
-;;; Copyright © 2020 Josh Marshall <joshua.r.marshall.1991@gmail.com>
 ;;; Copyright © 2020, 2021 Alexandros Theodotou <alex@zrythm.org>
+;;; Copyright © 2020 Josh Marshall <joshua.r.marshall.1991@gmail.com>
 ;;; Copyright © 2020 Lars-Dominik Braun <ldb@leibniz-psychology.org>
 ;;; Copyright © 2020 Alex ter Weele <alex.ter.weele@gmail.com>
 ;;; Copyright © 2020 Matthew James Kraai <kraai@ftbfs.org>
diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 3bb57ee2bd..6fa0987d24 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -28,7 +28,6 @@
 ;;; Copyright © 2016 David Craven <david@craven.ch>
 ;;; Copyright © 2016, 2017, 2018, 2019, 2020 Marius Bakke <
mbakke@fastmail.com>
 ;;; Copyright © 2016, 2017 Stefan Reichör <stefan@xsteve.at>
-;;; Copyright © 2016 Dylan Jeffers <sapientech@sapientech@openmailbox.org>
 ;;; Copyright © 2016, 2017 Alex Vong <alexvong1995@gmail.com>
 ;;; Copyright © 2016, 2017, 2018 Arun Isaac <arunisaac@systemreboot.net>
 ;;; Copyright © 2016, 2017, 2018 Julien Lepiller <julien@lepiller.eu>
@@ -43,7 +42,6 @@
 ;;; Copyright © 2017 Roel Janssen <roel@gnu.org>
 ;;; Copyright © 2017, 2018 Kei Kebreau <kkebreau@posteo.net>
 ;;; Copyright © 2017 Rutger Helling <rhelling@mykolab.com>
-;;; Copyright © 2017 Muriithi Frederick Muriuki <fredmanglis@gmail.com>
 ;;; Copyright © 2017 Brendan Tildesley <mail@brendan.scot>
 ;;; Copyright © 2018 Ethan R. Jones <ethanrjones97@gmail.com
 ;;; Copyright © 2018 Fis Trivial <ybbs.daans@hotmail.com>
diff --git a/gnu/packages/video.scm b/gnu/packages/video.scm
index c0be286cec..b6acebcecc 100644
--- a/gnu/packages/video.scm
+++ b/gnu/packages/video.scm
@@ -4,13 +4,12 @@
 ;;; Copyright © 2014, 2015, 2016, 2018, 2020 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2015 Taylan Ulrich Bayırlı/Kammer <taylanbayirli@gmail.com>
 ;;; Copyright © 2015, 2016, 2017, 2018, 2019, 2020, 2021 Efraim Flashner <
efraim@flashner.co.il>
-;;; Copyright © 2015 Andy Patterson <ajpatter@uwaterloo.ca>
+;;; Copyright © 2015, 2016 Andy Patterson <ajpatter@uwaterloo.ca>
 ;;; Copyright © 2015, 2018, 2019, 2020 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2015, 2016, 2017, 2018, 2019 Alex Vong <
alexvong1995@gmail.com>
 ;;; Copyright © 2016, 2017 Alex Griffin <a@ajgrf.com>
 ;;; Copyright © 2016 Kei Kebreau <kkebreau@posteo.net>
 ;;; Copyright © 2016 Dmitry Nikolaev <cameltheman@gmail.com>
-;;; Copyright © 2016 Andy Patterson <ajpatter@uwaterloo.ca>
 ;;; Copyright © 2016, 2017 Nikita <nikita@n0.is>
 ;;; Copyright © 2016, 2018, 2019, 2020, 2021 Eric Bavier <bavier@posteo.net
>
 ;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
diff --git a/gnu/packages/xdisorg.scm b/gnu/packages/xdisorg.scm
index eb3f30eca7..2e4eb30a9c 100644
--- a/gnu/packages/xdisorg.scm
+++ b/gnu/packages/xdisorg.scm
@@ -13,7 +13,6 @@
 ;;; Copyright © 2016, 2018 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2016, 2017, 2018, 2019, 2020 Efraim Flashner <
efraim@flashner.co.il>
 ;;; Copyright © 2016 Leo Famulari <leo@famulari.name>
-;;; Copyright © 2016 Alex Kost <alezost@gmail.com>
 ;;; Copyright © 2016, 2017, 2019, 2020 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2016 Petter <petter@mykolab.ch>
 ;;; Copyright © 2017 Mekeor Melire <mekeor.melire@gmail.com>
diff --git a/gnu/services/web.scm b/gnu/services/web.scm
index 6a093cf4e4..bb42eacf83 100644
--- a/gnu/services/web.scm
+++ b/gnu/services/web.scm
@@ -3,11 +3,10 @@
 ;;; Copyright © 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <
ludo@gnu.org>
 ;;; Copyright © 2016 Nikita <nikita@n0.is>
 ;;; Copyright © 2016, 2017, 2018 Julien Lepiller <julien@lepiller.eu>
-;;; Copyright © 2017 Christopher Baines <mail@cbaines.net>
+;;; Copyright © 2017, 2018, 2019 Christopher Baines <mail@cbaines.net>
 ;;; Copyright © 2017 nee <nee-git@hidamari.blue>
 ;;; Copyright © 2017, 2018 Clément Lassieur <clement@lassieur.org>
 ;;; Copyright © 2018 Pierre-Antoine Rouby <pierre-antoine.rouby@inria.fr>
-;;; Copyright © 2017, 2018, 2019 Christopher Baines <mail@cbaines.net>
 ;;; Copyright © 2018 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2019, 2020 Florian Pelz <pelzflorian@pelzflorian.de>
