diff --git a/crypto/cast.c b/crypto/cast.c
index abfb07f8755..eede26d2faa 100644
--- a/crypto/cast.c
+++ b/crypto/cast.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * crypto/cast.c
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * CAST-128 in C
  * Written by Steve Reid <sreid@sea-to-sky.net>
diff --git a/crypto/castsb.h b/crypto/castsb.h
index 24ecb8ed764..d767c87e29e 100644
--- a/crypto/castsb.h
+++ b/crypto/castsb.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * crypto/castsb.h
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * CAST-128 in C
  * Written by Steve Reid <sreid@sea-to-sky.net>
diff --git a/crypto/chacha_private.h b/crypto/chacha_private.h
index a2ec1445495..516b9a115ac 100644
--- a/crypto/chacha_private.h
+++ b/crypto/chacha_private.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * crypto/chacha_private.h
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * D. J. Bernstein
  * Public domain.
diff --git a/crypto/md5.c b/crypto/md5.c
index cfda17c60d0..dd53a32c652 100644
--- a/crypto/md5.c
+++ b/crypto/md5.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * crypto/md5.c
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * This code implements the MD5 message-digest algorithm.
  * The algorithm is due to Ron Rivest. This code was
diff --git a/crypto/poly1305.c b/crypto/poly1305.c
index bd34582ba53..1c279020b14 100644
--- a/crypto/poly1305.c
+++ b/crypto/poly1305.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * crypto/poly1305.c
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * Public Domain poly1305 from Andrew Moon
  *
diff --git a/crypto/rijndael.c b/crypto/rijndael.c
index 99e2e2c8658..61a343f6984 100644
--- a/crypto/rijndael.c
+++ b/crypto/rijndael.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * crypto/rijndael.c
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  * SPDX-FileContributor: Vincent Rijmen <vincent.rijmen@esat.kuleuven.ac.be>
  * SPDX-FileContributor: Antoon Bosselaers <antoon.bosselaers@esat.kuleuven.ac.be>
  * SPDX-FileContributor: Paulo Barreto <paulo.barreto@terra.com.br>
diff --git a/crypto/sha1.c b/crypto/sha1.c
index b19d96c7e61..2754e19ebbd 100644
--- a/crypto/sha1.c
+++ b/crypto/sha1.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * crypto/sha1.c
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * By Steve Reid <steve@edmweb.com>
  * 100% Public Domain
diff --git a/include/crypto/cast.h b/include/crypto/cast.h
index 1c9d025f95a..78d7bb39d33 100644
--- a/include/crypto/cast.h
+++ b/include/crypto/cast.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * include/crypto/cast.h
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * Written by Steve Reid <sreid@sea-to-sky.net>
  * 100% Public Domain - no warranty
diff --git a/include/crypto/md5.h b/include/crypto/md5.h
index d30381149f1..d491cf81f44 100644
--- a/include/crypto/md5.h
+++ b/include/crypto/md5.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * include/crypto/md5.h
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * This code implements the MD5 message-digest algorithm.
  * The algorithm is due to Ron Rivest.  This code was
diff --git a/include/crypto/poly1305.h b/include/crypto/poly1305.h
index 63d6600bdc6..e2be32200e0 100644
--- a/include/crypto/poly1305.h
+++ b/include/crypto/poly1305.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * include/crypto/poly1305.h
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * Public Domain poly1305 from Andrew Moon
  *
diff --git a/include/crypto/rijndael.h b/include/crypto/rijndael.h
index 6d40e29f01f..c07c4a9afb7 100644
--- a/include/crypto/rijndael.h
+++ b/include/crypto/rijndael.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * include/crypto/rijndael.h
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * SPDX-FileContributor: Vincent Rijmen <vincent.rijmen@esat.kuleuven.ac.be>
  * SPDX-FileContributor: Antoon Bosselaers <antoon.bosselaers@esat.kuleuven.ac.be>
diff --git a/include/crypto/sha1.h b/include/crypto/sha1.h
index f88793536d0..2362cc0147a 100644
--- a/include/crypto/sha1.h
+++ b/include/crypto/sha1.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * include/crypto/sha1.h
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * By Steve Reid <steve@edmweb.com>
  * 100% Public Domain
diff --git a/include/search.h b/include/search.h
index cb9cb1db324..2e2e01d4092 100644
--- a/include/search.h
+++ b/include/search.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * include/search.h
  *
- * SPDX-License-Identifier: NuttX-PublicDomain
+ * SPDX-License-Identifier: LicenseRef-NuttX-PublicDomain
  *
  * Written by J.T. Conklin <jtc@netbsd.org>
  * Public domain.