diff --git a/schema/bom-1.7.proto b/schema/bom-1.7.proto
index 6541354e..2988ea02 100644
--- a/schema/bom-1.7.proto
+++ b/schema/bom-1.7.proto
@@ -124,6 +124,7 @@ message Component {
   // The hashes of the component.
   repeated Hash hashes = 12;
   // A list of SPDX licenses and/or named licenses and/or SPDX License Expression.
+  // There should be no more than one per license acknowledgement.
   repeated LicenseChoice licenses = 13;
   // An optional copyright notice informing users of the underlying claims to copyright ownership in a published work.
   optional string copyright = 14;
@@ -574,6 +575,7 @@ message Metadata {
   optional OrganizationalEntity supplier = 6;
   // The license information for the BOM document. This may be different from the license(s) of the component(s) that the BOM describes.
   // A list of SPDX licenses and/or named licenses and/or SPDX License Expression.
+  // There should be no more than one per license acknowledgement.
   repeated LicenseChoice licenses = 7;
   // Specifies optional, custom, properties
   repeated Property properties = 8;
@@ -711,6 +713,7 @@ message Service {
   // Specifies information about the data including the directional flow of data and the data classification.
   repeated DataFlow data = 10;
   // A list of SPDX licenses and/or named licenses and/or SPDX License Expression.
+  // There should be no more than one per license acknowledgement.
   repeated LicenseChoice licenses = 11;
   // Provides the ability to document external references related to the service.
   repeated ExternalReference external_references = 12;
@@ -833,6 +836,7 @@ message EvidenceCopyright {
 // Provides the ability to document evidence collected through various forms of extraction or analysis.
 message Evidence {
   // A list of SPDX licenses and/or named licenses and/or SPDX License Expression.
+  // There should be no license acknowledgement assigned to any of these.
   repeated LicenseChoice licenses = 1;
   // Copyright evidence captures intellectual property assertions, providing evidence of possible ownership and legal protection.
   repeated EvidenceCopyright copyright = 2;
diff --git a/schema/bom-1.7.schema.json b/schema/bom-1.7.schema.json
index af102f0b..7f7c1a0a 100644
--- a/schema/bom-1.7.schema.json
+++ b/schema/bom-1.7.schema.json
@@ -714,7 +714,7 @@
         },
         "licenses": {
           "title": "BOM License(s)",
-          "description": "The license information for the BOM document.\nThis may be different from the license(s) of the component(s) that the BOM describes.",
+          "description": "The license information for the BOM document. This may be different from the license(s) of the component(s) that the BOM describes.\nThere should be no more than one per license acknowledgement.",
           "$ref": "#/definitions/licenseChoice"
         },
         "properties": {
@@ -1000,7 +1000,8 @@
         },
         "licenses": {
           "$ref": "#/definitions/licenseChoice",
-          "title": "Component License(s)"
+          "title": "Component License(s)",
+          "description": "A list of SPDX licenses and/or named licenses and/or SPDX License Expression.\nThere should be no more than one per license acknowledgement."
         },
         "copyright": {
           "type": "string",
@@ -2072,7 +2073,8 @@
         },
         "licenses": {
           "$ref": "#/definitions/licenseChoice",
-          "title": "Service License(s)"
+          "title": "Service License(s)",
+          "description": "A list of SPDX licenses and/or named licenses and/or SPDX License Expression.\nThere should be no more than one per license acknowledgement."
         },
         "patentAssertions": {
           "$ref": "#/definitions/patentAssertions",
@@ -2350,7 +2352,8 @@
         },
         "licenses": {
           "$ref": "#/definitions/licenseChoice",
-          "title": "License Evidence"
+          "title": "License Evidence",
+          "description": "A list of SPDX licenses and/or named licenses and/or SPDX License Expression.\nThere should be no license acknowledgement assigned to any of these."
         },
         "copyright": {
           "type": "array",
diff --git a/schema/bom-1.7.xsd b/schema/bom-1.7.xsd
index ae0112a2..011c0b4f 100644
--- a/schema/bom-1.7.xsd
+++ b/schema/bom-1.7.xsd
@@ -243,6 +243,7 @@ limitations under the License.
                     <xs:documentation>
                         The license information for the BOM document.
                         This may be different from the license(s) of the component(s) that the BOM describes.
+                        There should be no more than one per license acknowledgement.
                     </xs:documentation>
                 </xs:annotation>
             </xs:element>
@@ -647,7 +648,14 @@ limitations under the License.
                     </xs:sequence>
                 </xs:complexType>
             </xs:element>
-            <xs:element name="licenses" type="bom:licenseChoiceType" minOccurs="0" maxOccurs="1"/>
+            <xs:element name="licenses" type="bom:licenseChoiceType" minOccurs="0" maxOccurs="1">
+                <xs:annotation>
+                    <xs:documentation>
+                        A list of SPDX licenses and/or named licenses and/or SPDX License Expression.
+                        There should be no more than one per license acknowledgement.
+                    </xs:documentation>
+                </xs:annotation>
+            </xs:element>
             <xs:element name="copyright" type="xs:normalizedString" minOccurs="0" maxOccurs="1">
                 <xs:annotation>
                     <xs:documentation>A copyright notice informing users of the underlying claims to copyright ownership in a published work.</xs:documentation>
@@ -2428,7 +2436,14 @@ limitations under the License.
                     </xs:choice>
                 </xs:complexType>
             </xs:element>
-            <xs:element name="licenses" type="bom:licenseChoiceType" minOccurs="0" maxOccurs="1"/>
+            <xs:element name="licenses" type="bom:licenseChoiceType" minOccurs="0" maxOccurs="1">
+                <xs:annotation>
+                    <xs:documentation>
+                        A list of SPDX licenses and/or named licenses and/or SPDX License Expression.
+                        There should be no more than one per license acknowledgement.
+                    </xs:documentation>
+                </xs:annotation>
+            </xs:element>
             <xs:element name="patentAssertions" minOccurs="0" maxOccurs="1">
                 <xs:annotation>
                     <xs:documentation>
@@ -2890,7 +2905,14 @@ limitations under the License.
                     </xs:sequence>
                 </xs:complexType>
             </xs:element>
-            <xs:element name="licenses" type="bom:licenseChoiceType" minOccurs="0" maxOccurs="1"/>
+            <xs:element name="licenses" type="bom:licenseChoiceType" minOccurs="0" maxOccurs="1">
+                <xs:annotation>
+                    <xs:documentation>
+                        A list of SPDX licenses and/or named licenses and/or SPDX License Expression.
+                        There should be no license acknowledgement assigned to any of these.
+                    </xs:documentation>
+                </xs:annotation>
+            </xs:element>
             <xs:element name="copyright" type="bom:copyrightsType" minOccurs="0" maxOccurs="1">
                 <xs:annotation>
                     <xs:documentation>