diff --git a/libwvdrmengine/cdm/core/src/license_protocol.proto b/libwvdrmengine/cdm/core/src/license_protocol.proto
index 6692daad..883b54ac 100644
--- a/libwvdrmengine/cdm/core/src/license_protocol.proto
+++ b/libwvdrmengine/cdm/core/src/license_protocol.proto
@@ -592,6 +592,14 @@ message ClientIdentification {
     optional AnalogOutputCapabilities analog_output_capabilities = 10
         [default = ANALOG_OUTPUT_UNKNOWN];
     optional bool can_disable_analog_output = 11 [default = false];
+    // Clients can indicate a performance level supported by OEMCrypto.
+    // This will allow applications and providers to choose an appropriate
+    // quality of content to serve. Currently defined tiers are
+    // 1 (low), 2 (medium) and 3 (high). Any other value indicates that
+    // the resource rating is unavailable or reporting erroneous values
+    // for that device. For details see,
+    // Widevine Modular DRM Security Integration Guide for CENC
+    optional uint32 resource_rating_tier = 12 [default = 0];
   }
 
   // Type of factory-provisioned device root of trust. Optional.