diff --git a/libwvdrmengine/cdm/core/src/crypto_session.cpp b/libwvdrmengine/cdm/core/src/crypto_session.cpp
index c5c17cb0..d51a415a 100644
--- a/libwvdrmengine/cdm/core/src/crypto_session.cpp
+++ b/libwvdrmengine/cdm/core/src/crypto_session.cpp
@@ -665,7 +665,9 @@ CdmResponseType CryptoSession::Decrypt(const CdmDecryptionParameters& params) {
   }
 
   OEMCryptoResult sts = OEMCrypto_ERROR_NOT_IMPLEMENTED;
-  if (!params.is_encrypted) {
+  if (!params.is_encrypted  &&
+      params.subsample_flags ==
+          (OEMCrypto_FirstSubsample | OEMCrypto_LastSubsample)) {
     sts = OEMCrypto_CopyBuffer(requested_security_level_,
                                params.encrypt_buffer, params.encrypt_length,
                                &buffer_descriptor, params.subsample_flags);