Prefer HTTPS to FTP and HTTP in documentation

Most of this change is to boilerplate commentary such as license URLs.
This change was prompted by ftp://ftp.gnu.org's going-away party,
planned for November.  Change these FTP URLs to https://ftp.gnu.org
instead.  Make similar changes for URLs to other organizations moving
away from FTP.  Also, change HTTP to HTTPS for URLs to gnu.org and
fsf.org when this works, as this will further help defend against
man-in-the-middle attacks (for this part I omitted the MS-DOS and
MS-Windows sources and the test tarballs to keep the workload down).
HTTPS is not fully working to lists.gnu.org so I left those URLs alone
for now.

42 files changed, 43 insertions, 43 deletions

diff --git a/lisp/mail/binhex.el b/lisp/mail/binhex.el
index 1d6828b44bb..f055215a8c6 100644
--- a/lisp/mail/binhex.el
+++ b/lisp/mail/binhex.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/blessmail.el b/lisp/mail/blessmail.el
index fc3b9618d68..c5e634607a3 100644
--- a/lisp/mail/blessmail.el
+++ b/lisp/mail/blessmail.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/emacsbug.el b/lisp/mail/emacsbug.el
index c1aec6923fb..7bd90783423 100644
--- a/lisp/mail/emacsbug.el
+++ b/lisp/mail/emacsbug.el
@@ -21,7 +21,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
@@ -187,7 +187,7 @@ Prompts for bug subject.  Leaves you in a mail buffer."
 	 'face 'link
 	 'help-echo (concat "mouse-2, RET: Follow this link")
 	 'action (lambda (button)
-		   (browse-url "http://debbugs.gnu.org/"))
+		   (browse-url "https://debbugs.gnu.org/"))
 	 'follow-link t)
 
 	(insert ".  Please check that
diff --git a/lisp/mail/flow-fill.el b/lisp/mail/flow-fill.el
index 860d353002c..130e1640572 100644
--- a/lisp/mail/flow-fill.el
+++ b/lisp/mail/flow-fill.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/footnote.el b/lisp/mail/footnote.el
index 07e24bd78be..5e18d892d4a 100644
--- a/lisp/mail/footnote.el
+++ b/lisp/mail/footnote.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/hashcash.el b/lisp/mail/hashcash.el
index 71567b4c0fd..ff00ce4069e 100644
--- a/lisp/mail/hashcash.el
+++ b/lisp/mail/hashcash.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/ietf-drums.el b/lisp/mail/ietf-drums.el
index fd793a28309..86496beb0fd 100644
--- a/lisp/mail/ietf-drums.el
+++ b/lisp/mail/ietf-drums.el
@@ -16,7 +16,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/mail-extr.el b/lisp/mail/mail-extr.el
index 180d195d553..81af0d541cf 100644
--- a/lisp/mail/mail-extr.el
+++ b/lisp/mail/mail-extr.el
@@ -21,7 +21,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/mail-hist.el b/lisp/mail/mail-hist.el
index b056739c655..b525d8972c3 100644
--- a/lisp/mail/mail-hist.el
+++ b/lisp/mail/mail-hist.el
@@ -20,7 +20,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/mail-parse.el b/lisp/mail/mail-parse.el
index 0578b98c933..49df82c38b0 100644
--- a/lisp/mail/mail-parse.el
+++ b/lisp/mail/mail-parse.el
@@ -16,7 +16,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/mail-prsvr.el b/lisp/mail/mail-prsvr.el
index 07f650942c0..9703e47fc30 100644
--- a/lisp/mail/mail-prsvr.el
+++ b/lisp/mail/mail-prsvr.el
@@ -16,7 +16,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/mail-utils.el b/lisp/mail/mail-utils.el
index c23af873650..0164ffdc46f 100644
--- a/lisp/mail/mail-utils.el
+++ b/lisp/mail/mail-utils.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/mailabbrev.el b/lisp/mail/mailabbrev.el
index 4e3a3f9d118..ef0e40f0201 100644
--- a/lisp/mail/mailabbrev.el
+++ b/lisp/mail/mailabbrev.el
@@ -21,7 +21,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/mailalias.el b/lisp/mail/mailalias.el
index 8f3f901c22a..56fdd26b383 100644
--- a/lisp/mail/mailalias.el
+++ b/lisp/mail/mailalias.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/mailclient.el b/lisp/mail/mailclient.el
index 88624199df7..102730f476a 100644
--- a/lisp/mail/mailclient.el
+++ b/lisp/mail/mailclient.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/mailheader.el b/lisp/mail/mailheader.el
index bceba77c46d..b388c32c73b 100644
--- a/lisp/mail/mailheader.el
+++ b/lisp/mail/mailheader.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/metamail.el b/lisp/mail/metamail.el
index 4e0802804f4..e4886eabe61 100644
--- a/lisp/mail/metamail.el
+++ b/lisp/mail/metamail.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/mspools.el b/lisp/mail/mspools.el
index 21856c325c7..13a39e52119 100644
--- a/lisp/mail/mspools.el
+++ b/lisp/mail/mspools.el
@@ -21,7 +21,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/qp.el b/lisp/mail/qp.el
index 262191db4ac..9533697c778 100644
--- a/lisp/mail/qp.el
+++ b/lisp/mail/qp.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/reporter.el b/lisp/mail/reporter.el
index b13da94c407..6cb5e4a8873 100644
--- a/lisp/mail/reporter.el
+++ b/lisp/mail/reporter.el
@@ -20,7 +20,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rfc2045.el b/lisp/mail/rfc2045.el
index 11a6151887a..f5185d22f74 100644
--- a/lisp/mail/rfc2045.el
+++ b/lisp/mail/rfc2045.el
@@ -16,7 +16,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;; RFC 2045 is: "Multipurpose Internet Mail Extensions (MIME) Part
 ;; One:  Format of Internet Message Bodies".
diff --git a/lisp/mail/rfc2047.el b/lisp/mail/rfc2047.el
index e2af86b3246..0c93331de8b 100644
--- a/lisp/mail/rfc2047.el
+++ b/lisp/mail/rfc2047.el
@@ -17,7 +17,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rfc2231.el b/lisp/mail/rfc2231.el
index 66f539f6986..e27113a9e39 100644
--- a/lisp/mail/rfc2231.el
+++ b/lisp/mail/rfc2231.el
@@ -16,7 +16,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rfc2368.el b/lisp/mail/rfc2368.el
index 6cb243ce5c1..3f09f87f1b3 100644
--- a/lisp/mail/rfc2368.el
+++ b/lisp/mail/rfc2368.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 ;;
diff --git a/lisp/mail/rfc822.el b/lisp/mail/rfc822.el
index 5edcef54284..e8bbea32573 100644
--- a/lisp/mail/rfc822.el
+++ b/lisp/mail/rfc822.el
@@ -20,7 +20,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rmail-spam-filter.el b/lisp/mail/rmail-spam-filter.el
index 648aa22aaa5..dee2d1c5133 100644
--- a/lisp/mail/rmail-spam-filter.el
+++ b/lisp/mail/rmail-spam-filter.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 ;;; -----------
diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index b2405882896..12b1191e988 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rmailedit.el b/lisp/mail/rmailedit.el
index e9bb5560df8..b91a81503e2 100644
--- a/lisp/mail/rmailedit.el
+++ b/lisp/mail/rmailedit.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rmailkwd.el b/lisp/mail/rmailkwd.el
index 761a58f9311..b366e5c71bc 100644
--- a/lisp/mail/rmailkwd.el
+++ b/lisp/mail/rmailkwd.el
@@ -20,7 +20,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rmailmm.el b/lisp/mail/rmailmm.el
index 1ffd4668ac8..60b2066b2c2 100644
--- a/lisp/mail/rmailmm.el
+++ b/lisp/mail/rmailmm.el
@@ -21,7 +21,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rmailmsc.el b/lisp/mail/rmailmsc.el
index ac151f97fa6..b53b95ea52c 100644
--- a/lisp/mail/rmailmsc.el
+++ b/lisp/mail/rmailmsc.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rmailout.el b/lisp/mail/rmailout.el
index a2f9320446e..8b918ec6e6c 100644
--- a/lisp/mail/rmailout.el
+++ b/lisp/mail/rmailout.el
@@ -20,7 +20,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rmailsort.el b/lisp/mail/rmailsort.el
index 681a9c4340c..a668d2e0bd8 100644
--- a/lisp/mail/rmailsort.el
+++ b/lisp/mail/rmailsort.el
@@ -21,7 +21,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/rmailsum.el b/lisp/mail/rmailsum.el
index 37ac46c6af6..95d9b63f14f 100644
--- a/lisp/mail/rmailsum.el
+++ b/lisp/mail/rmailsum.el
@@ -20,7 +20,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/sendmail.el b/lisp/mail/sendmail.el
index 12d69aa23c3..3e22fd84117 100644
--- a/lisp/mail/sendmail.el
+++ b/lisp/mail/sendmail.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/smtpmail.el b/lisp/mail/smtpmail.el
index 93bfe0e39d8..aff90d33ed3 100644
--- a/lisp/mail/smtpmail.el
+++ b/lisp/mail/smtpmail.el
@@ -24,7 +24,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/supercite.el b/lisp/mail/supercite.el
index f3a6e3115bd..c0dd7aaf599 100644
--- a/lisp/mail/supercite.el
+++ b/lisp/mail/supercite.el
@@ -20,7 +20,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;; LCD Archive Entry
 ;; supercite|Barry A. Warsaw|supercite-help@python.org
diff --git a/lisp/mail/uce.el b/lisp/mail/uce.el
index 3dce1c69023..db50c4e6bf6 100644
--- a/lisp/mail/uce.el
+++ b/lisp/mail/uce.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/undigest.el b/lisp/mail/undigest.el
index 73d7464bc13..77e97c7be91 100644
--- a/lisp/mail/undigest.el
+++ b/lisp/mail/undigest.el
@@ -19,7 +19,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/unrmail.el b/lisp/mail/unrmail.el
index 2ff66467478..16e1ba3995f 100644
--- a/lisp/mail/unrmail.el
+++ b/lisp/mail/unrmail.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/uudecode.el b/lisp/mail/uudecode.el
index e68acbd2b8f..2811b0bf44a 100644
--- a/lisp/mail/uudecode.el
+++ b/lisp/mail/uudecode.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
diff --git a/lisp/mail/yenc.el b/lisp/mail/yenc.el
index c8e2d2c7bcd..b84b16144d3 100644
--- a/lisp/mail/yenc.el
+++ b/lisp/mail/yenc.el
@@ -18,7 +18,7 @@
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
 
 ;;; Commentary: