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-.TH PNG 5 "September 1, 2016"
+.TH PNG 5 "April 1, 2017"
.SH NAME
png \- Portable Network Graphics (PNG) format
.SH DESCRIPTION
@@ -23,11 +23,11 @@ platforms.
PNG specification (second edition), November 2003:
.IP
.br
- <http://www.w3.org/TR/2003/REC-PNG-20031110/
+ <https://www.w3.org/TR/2003/REC-PNG-20031110/
PNG 1.2 specification, July 1999:
.IP
.br
-http://png-mng.sourceforge.net/pub/png/spec/1.2/
+https://png-mng.sourceforge.io/pub/png/spec/1.2/
.LP
PNG 1.0 specification, October 1996:
.IP
@@ -35,11 +35,11 @@ PNG 1.0 specification, October 1996:
RFC 2083
.IP
.br
-http://www.ietf.org/rfc/rfc2083.txt
+https://www.ietf.org/rfc/rfc2083.txt
.br
or (as a W3C Recommendation) at
.br
-http://www.w3.org/TR/REC-png-961001
+https://www.w3.org/TR/REC-png-961001
.SH AUTHORS
This man page: Glenn Randers-Pehrson
.LP