diff --git a/LICENCE.MIT.txt b/LICENCE.MIT.txt
new file mode 100644
index 0000000..af1beaf
--- /dev/null
+++ b/LICENCE.MIT.txt
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Call-Em-All
+
+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.
diff --git a/README.md b/README.md
index e85c870..f33a099 100644
--- a/README.md
+++ b/README.md
@@ -62,3 +62,6 @@ Facebook & Twitter icons CC-Attrib https://fairheadcreative.com.
 - [License](./LICENSE.txt)
 - [Contributing](./CONTRIBUTING.md)
 - [Code Of Conduct](./CODE_OF_CONDUCT.md)
+
+SVG icons `container-lock.svg`, `container-unlock.svg` attributed to https://github.com/mui-org/material-ui
+and covered by the [MIT Licence](./LICENCE.MIT.txt).
\ No newline at end of file
diff --git a/src/img/container-lock.svg b/src/img/container-lock.svg
index b54c206..cdcd3d5 100644
--- a/src/img/container-lock.svg
+++ b/src/img/container-lock.svg
@@ -1,7 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
-
-<!-- Adapted from https://www.materialui.co/icon/lock -->
-
 <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
 	 viewBox="0 0 24 24" style="enable-background:new 0 0 24 24;" xml:space="preserve">
   <path d="M18 8h-1V6c0-2.76-2.24-5-5-5S7 3.24 7 6v2H6c-1.1 0-2 .9-2 2v10c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V10c0-1.1-.9-2-2-2zm-6 9c-1.1 0-2-.9-2-2s.9-2 2-2 2 .9 2 2-.9 2-2 2zm3.1-9H8.9V6c0-1.71 1.39-3.1 3.1-3.1 1.71 0 3.1 1.39 3.1 3.1v2z"/>
diff --git a/src/img/container-unlock.svg b/src/img/container-unlock.svg
index 58fc6b0..1af57c3 100644
--- a/src/img/container-unlock.svg
+++ b/src/img/container-unlock.svg
@@ -1,7 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
-
-<!-- Adapted from https://www.materialui.co/icon/lock-open -->
-
 <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
 	 viewBox="0 0 24 24" style="enable-background:new 0 0 24 24;" xml:space="preserve">
   <path d="M12 17c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm6-9h-1V6c0-2.76-2.24-5-5-5S7 3.24 7 6h1.9c0-1.71 1.39-3.1 3.1-3.1 1.71 0 3.1 1.39 3.1 3.1v2H6c-1.1 0-2 .9-2 2v10c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V10c0-1.1-.9-2-2-2zm0 12H6V10h12v10z"/>