4 files changed, 25 insertions, 0 deletions
diff --git a/crypto/asymmetric_keys/pkcs7.asn1 b/crypto/asymmetric_keys/pkcs7.asn1
index 1eca740b816a..28e1f4a41c14 100644
--- a/crypto/asymmetric_keys/pkcs7.asn1
+++ b/crypto/asymmetric_keys/pkcs7.asn1
@@ -1,3 +1,10 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 2009 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc5652#section-3
+
 PKCS7ContentInfo ::= SEQUENCE {
 	contentType	ContentType ({ pkcs7_check_content_type }),
 	content		[0] EXPLICIT SignedData OPTIONAL
diff --git a/crypto/asymmetric_keys/pkcs8.asn1 b/crypto/asymmetric_keys/pkcs8.asn1
index 702c41a3c713..a2a8af2633d8 100644
--- a/crypto/asymmetric_keys/pkcs8.asn1
+++ b/crypto/asymmetric_keys/pkcs8.asn1
@@ -1,3 +1,9 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 2010 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc5958#section-2
 --
 -- This is the unencrypted variant
 --
diff --git a/crypto/asymmetric_keys/x509.asn1 b/crypto/asymmetric_keys/x509.asn1
index 92d59c32f96a..feb9573cacce 100644
--- a/crypto/asymmetric_keys/x509.asn1
+++ b/crypto/asymmetric_keys/x509.asn1
@@ -1,3 +1,10 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 2008 IETF Trust and the persons identified as authors
+-- of the code
+--
+-- https://www.rfc-editor.org/rfc/rfc5280#section-4
+
 Certificate ::= SEQUENCE {
 	tbsCertificate		TBSCertificate ({ x509_note_tbs_certificate }),
 	signatureAlgorithm	AlgorithmIdentifier,
diff --git a/crypto/asymmetric_keys/x509_akid.asn1 b/crypto/asymmetric_keys/x509_akid.asn1
index c7818ff4e606..0f8355cf1907 100644
--- a/crypto/asymmetric_keys/x509_akid.asn1
+++ b/crypto/asymmetric_keys/x509_akid.asn1
@@ -1,3 +1,8 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+--
+-- Copyright (C) 2008 IETF Trust and the persons identified as authors
+-- of the code
+--
 -- X.509 AuthorityKeyIdentifier
 -- rfc5280 section 4.2.1.1