diff --git a/README.md b/README.md
index 8c91910..6976866 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,6 @@ Many icons were used and modified in the creation of these sets from [The Noun P
#### Flaticon - [flaticon.com](https://www.flaticon.com/)
* [Android icon](https://www.flaticon.com/free-icon/android-logo_61120) made by [Google](https://www.flaticon.com/authors/google)
-* [Lock icon](https://www.flaticon.com/free-icon/lock_483408) made by [Those Icons](https://www.flaticon.com/authors/those-icons)
* [DTD icon](https://www.flaticon.com/free-icon/dtd-file-format-extension_29547) made by [Freepik](https://www.flaticon.com/authors/freepik)
* [Publisher icon](https://www.flaticon.com/free-icon/microsoft-publisher_2118) made by [Freepik](https://www.flaticon.com/authors/freepik)
* [Firefox icon](https://www.flaticon.com/free-icon/firefox-logotype_1602) made by [Freepik](https://www.flaticon.com/authors/freepik)
diff --git a/icons/classic/cer.svg b/icons/classic/cer.svg
index 865c2a3..3dbf3e0 100644
--- a/icons/classic/cer.svg
+++ b/icons/classic/cer.svg
@@ -23,24 +23,19 @@
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diff --git a/icons/classic/crt.svg b/icons/classic/crt.svg
index 455f030..c22a269 100644
--- a/icons/classic/crt.svg
+++ b/icons/classic/crt.svg
@@ -23,24 +23,19 @@
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diff --git a/icons/classic/pem.svg b/icons/classic/pem.svg
index 30846c9..8e8f14f 100644
--- a/icons/classic/pem.svg
+++ b/icons/classic/pem.svg
@@ -23,24 +23,19 @@
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diff --git a/icons/vivid/cer.svg b/icons/vivid/cer.svg
index f2e0fa3..d3409e1 100644
--- a/icons/vivid/cer.svg
+++ b/icons/vivid/cer.svg
@@ -18,13 +18,8 @@
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diff --git a/icons/vivid/crt.svg b/icons/vivid/crt.svg
index 582451d..7529b46 100644
--- a/icons/vivid/crt.svg
+++ b/icons/vivid/crt.svg
@@ -18,13 +18,8 @@
l-2-4.8h-0.8v4.8H19V6.4z M22.9,13c0.9,0,1.6-0.7,1.6-1.9c0-0.7-0.2-1.2-0.6-1.5c-0.3-0.2-0.6-0.3-0.9-0.3h-0.7V13H22.9z"/>
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diff --git a/icons/vivid/pem.svg b/icons/vivid/pem.svg
new file mode 100644
index 0000000..cfdef57
--- /dev/null
+++ b/icons/vivid/pem.svg
@@ -0,0 +1,26 @@
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