diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..670154e
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,116 @@
+CC0 1.0 Universal
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diff --git a/README.md b/README.md
index 54ff116..b37de64 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,7 @@ This reference implementation supports all parameter sets as defined in the Draf
_While the behavior of the code in this repository is supposed to be stable, the API is not yet fully complete. In particular, the wrapper for run-time parameters does not yet support the back-end functions that make use of BDS traversal (TODO). We will also add more extensive test functionality, making it easier to compare to other XMSS implementations (TODO)._
_When using the current code base, please be careful, expect changes and watch this document for further documentation._
+
+### License
+
+This reference implementation was written by Andreas Hülsing and Joost Rijneveld. All included code is available under the CC0 1.0 Universal Public Domain Dedication.
diff --git a/hash.c b/hash.c
index 3f292cf..424adbf 100644
--- a/hash.c
+++ b/hash.c
@@ -1,10 +1,3 @@
-/*
-hash.c version 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
-
#include "hash_address.h"
#include "xmss_commons.h"
#include "params.h"
diff --git a/hash.h b/hash.h
index 9d1edd8..f44d9f3 100644
--- a/hash.h
+++ b/hash.h
@@ -1,10 +1,3 @@
-/*
-hash.h version 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
-
#ifndef XMSS_HASH_H
#define XMSS_HASH_H
diff --git a/hash_address.c b/hash_address.c
index ef818db..b74043e 100644
--- a/hash_address.c
+++ b/hash_address.c
@@ -1,9 +1,3 @@
-/*
-hash_address.c version 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
#include
void set_layer_addr(uint32_t addr[8], uint32_t layer) {
diff --git a/hash_address.h b/hash_address.h
index 3944c79..776b070 100644
--- a/hash_address.h
+++ b/hash_address.h
@@ -1,10 +1,3 @@
-/*
-hash_address.h version 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
-
#ifndef XMSS_HASH_ADDRESS_H
#define XMSS_HASH_ADDRESS_H
diff --git a/wots.c b/wots.c
index ecf02f3..47d2571 100644
--- a/wots.c
+++ b/wots.c
@@ -1,10 +1,3 @@
-/*
-wots.c version 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
-
#include
#include "xmss_commons.h"
#include "hash.h"
diff --git a/wots.h b/wots.h
index c67b27c..d1b4266 100644
--- a/wots.h
+++ b/wots.h
@@ -1,10 +1,3 @@
-/*
-wots.h version 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
-
#ifndef XMSS_WOTS_H
#define XMSS_WOTS_H
diff --git a/xmss_commons.c b/xmss_commons.c
index 521a979..5febacb 100644
--- a/xmss_commons.c
+++ b/xmss_commons.c
@@ -1,10 +1,3 @@
-/*
-xmss_commons.c 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
-
#include
#include
#include
diff --git a/xmss_commons.h b/xmss_commons.h
index ac91d1f..3757d2e 100644
--- a/xmss_commons.h
+++ b/xmss_commons.h
@@ -1,9 +1,3 @@
-/*
-xmss_commons.h 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
#ifndef XMSS_COMMONS_H
#define XMSS_COMMONS_H
diff --git a/xmss_core.c b/xmss_core.c
index 06ade46..31472ba 100644
--- a/xmss_core.c
+++ b/xmss_core.c
@@ -1,10 +1,3 @@
-/*
-xmss.c version 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
-
#include
#include
#include
diff --git a/xmss_core.h b/xmss_core.h
index 5be5026..83c8297 100644
--- a/xmss_core.h
+++ b/xmss_core.h
@@ -1,9 +1,3 @@
-/*
-xmss.h version 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
#ifndef XMSS_CORE_H
#define XMSS_CORE_H
diff --git a/xmss_core_fast.c b/xmss_core_fast.c
index a1415a1..d46a8c6 100644
--- a/xmss_core_fast.c
+++ b/xmss_core_fast.c
@@ -1,10 +1,3 @@
-/*
-xmss_fast.c version 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
-
#include
#include
#include
diff --git a/xmss_core_fast.h b/xmss_core_fast.h
index 8afb678..767dedd 100644
--- a/xmss_core_fast.h
+++ b/xmss_core_fast.h
@@ -1,10 +1,3 @@
-/*
-xmss_fast.h version 20160722
-Andreas Hülsing
-Joost Rijneveld
-Public domain.
-*/
-
#ifndef XMSS_CORE_H
#define XMSS_CORE_H