diff --git a/doc/logo/copyright.html b/doc/logo/copyright.html
new file mode 100644
index 00000000..2c687c56
--- /dev/null
+++ b/doc/logo/copyright.html
@@ -0,0 +1,11 @@
+<hr class="footer"/>
+
+<p style="text-align: right;padding-right: 12px;">
+	XZ logo &copy; 2023 by Jia Tan is licensed under
+	<a href="COPYING.CC-BY-SA-4.0"
+	   target="_blank"
+	   rel="license noopener noreferrer"
+	   style="display:inline-block;">
+		CC BY-SA 4.0
+	</a>
+</p>
diff --git a/doc/logo/xz-logo.png b/doc/logo/xz-logo.png
new file mode 100644
index 00000000..f9d6313d
Binary files /dev/null and b/doc/logo/xz-logo.png differ
diff --git a/doxygen/Doxyfile b/doxygen/Doxyfile
index 14350cf4..a4bc9b8d 100644
--- a/doxygen/Doxyfile
+++ b/doxygen/Doxyfile
@@ -61,7 +61,7 @@ PROJECT_BRIEF          =
 # pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
 # the logo to the output directory.
 
-PROJECT_LOGO           =
+PROJECT_LOGO           = ../doc/logo/xz-logo.png
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is
@@ -1246,7 +1246,7 @@ HTML_HEADER            =
 # that doxygen normally uses.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_FOOTER            =
+HTML_FOOTER            = ../doc/logo/copyright.html
 
 # The HTML_STYLESHEET tag can be used to specify a user-defined cascading style
 # sheet that is used by each HTML page. It can be used to fine-tune the look of
@@ -1286,7 +1286,7 @@ HTML_EXTRA_STYLESHEET  =
 # files will be copied as-is; there are no commands or markers available.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_EXTRA_FILES       =
+HTML_EXTRA_FILES       = ../COPYING.CC-BY-SA-4.0
 
 # The HTML_COLORSTYLE tag can be used to specify if the generated HTML output
 # should be rendered with a dark or light theme.