diff --git a/DRM/cc54/inc/wv_mod_drm_api.h b/DRM/cc54/inc/wv_mod_drm_api.h
index d3be933..4e5cab0 100755
--- a/DRM/cc54/inc/wv_mod_drm_api.h
+++ b/DRM/cc54/inc/wv_mod_drm_api.h
@@ -165,8 +165,7 @@
                                  uint32_t num_keys,
                                  const struct drm_wv_mod_key_object *key_array,
                                  const uint8_t *pst,
-                                 uint32_t pst_length,
-                                 const uint8_t *srm_restriction_data);
+                                 uint32_t pst_length);
 
 uint32_t drm_wv_mod_v9_generate_rsa_signature(uint32_t session_id,
                                               const uint8_t *message,
@@ -214,6 +213,7 @@
  *   Flag indicating if the table has changed since the last
  *   update_usage_table or load_usage_table call.
  *
+ * TODO: Return documentation
  */
 uint32_t drm_wv_mod_update_usage_table(uint8_t *const usage_table_data,
                                        uint32_t data_size,
@@ -221,8 +221,8 @@
 
 // NOTE: drm_wv_mod_update_usage_table shall be called after calling this
 // function
-uint32_t drm_wv_mod_deactivate_usage_entry(uint32_t session_id,
-                                           const uint8_t *const pst,
+// TODO: Documentation
+uint32_t drm_wv_mod_deactivate_usage_entry(const uint8_t *const pst,
                                            uint32_t pst_length);
 
 /**
@@ -243,6 +243,7 @@
  *   sizeof(struct OEMCrypto_PST_Report) in length. If extra space is provided,
  *   this field will reflect the actual size of the returned report.
  *
+ * TODO: Return documentation
  */
 uint32_t drm_wv_mod_report_usage(uint32_t session_id,
                                  const uint8_t *const pst,
@@ -270,6 +271,7 @@
  * @param[in] signature_length
  *   Length of signature buffer in bytes
  *
+ * TODO: Return Documentation
  */
 uint32_t drm_wv_mod_delete_usage_entry(uint32_t session_id,
                                        const uint8_t *const pst,
@@ -281,6 +283,7 @@
 
 // This will only clear Chaabi TEE memory. Caller is responsible for deleting
 // usage table file from file system.
+// TODO: Documentation
 uint32_t drm_wv_mod_delete_usage_table(void);
 
 
@@ -347,80 +350,4 @@
                                uint32_t       cleartext_length,
                                const uint8_t  *iv);
 
-/*! Version 13 specific APIs */
-
-/*!
- * Create a new Usage Table Header with no entries.
- */
-uint32_t drm_wv_mod_create_usage_table_header(uint8_t *header_buffer,
-                                              uint32_t *header_buffer_length,
-                                              uint64_t system_time);
-
-/*!
- * Loads the usage table header into TEE.
- */
-uint32_t drm_wv_mod_load_usage_table_header(const uint8_t *buffer,
-                                            uint32_t buffer_length,
-                                            uint64_t system_time);
-
-/*!
- * Create a new usage entry.
- */
-uint32_t drm_wv_mod_create_new_usage_entry(uint32_t session_id,
-                                           uint32_t *usage_entry_number);
-
-/*!
- * Load a usage table saved by update usage entry.
- */
-uint32_t drm_wv_mod_load_usage_entry(uint32_t session_id,
-                                     uint32_t index,
-                                     const uint8_t *buffer,
-                                     uint32_t buffer_length);
-
-/*!
- * Updates session usage entry.
- */
-uint32_t drm_wv_mod_update_usage_entry(uint32_t session_id,
-                                       uint8_t *header_buffer,
-                                       uint32_t *header_buffer_length,
-                                       uint8_t *entry_buffer,
-                                       uint32_t *entry_buffer_length);
-
-/*!
- * Move usage entry with current session from one location in header to another.
- */
-uint32_t drm_wv_mod_move_entry(uint32_t session_id,
-                               uint32_t new_index);
-
-/*!
- * Shrinks the usage table and the header.
- */
-uint32_t drm_wv_mod_shrink_usage_table_header(uint32_t new_entry_count,
-                                              uint8_t *header_buffer,
-                                              uint32_t *header_buffer_length);
-
-/*!
- * Copies an entry from old v12(or earlier) usage table to new table.
- */
-uint32_t drm_wv_mod_copy_old_usage_entry(uint32_t session_id,
-                                         const uint8_t *pst,
-                                         uint32_t pst_length);
-
-/*!
- * Delete the old usage table.
- */
-uint32_t drm_wv_mod_delete_old_usage_table(void);
-
-/*!
- * Create old usage entry.
- */
-uint32_t drm_wv_mod_create_old_usage_entry(uint64_t time_since_license_received,
-                                           uint64_t time_since_first_decrypt,
-                                           uint64_t time_since_last_decrypt,
-                                           enum drm_wv_mod_usage_entry_status status,
-                                           uint8_t *server_mac_key,
-                                           uint8_t *client_mac_key,
-                                           const uint8_t *pst,
-                                           uint32_t pst_length);
-
 #endif /* __WV_MOD_DRM_API_H_ */
diff --git a/DRM/cc54/inc/wv_mod_drm_error.h b/DRM/cc54/inc/wv_mod_drm_error.h
index 6b33d08..b10c2eb 100755
--- a/DRM/cc54/inc/wv_mod_drm_error.h
+++ b/DRM/cc54/inc/wv_mod_drm_error.h
@@ -58,7 +58,7 @@
     DRM_WV_MOD_ENCRYPTION_DECRYPTION_SIZE_INCORRECT,
     DRM_WV_MOD_ERROR_BUFFER_TOO_SMALL,
     DRM_WV_MOD_ERROR_BUFFER_TYPE_INVALID,
-    DRM_WV_MOD_ERROR_BUFFER_TOO_LARGE,
+    DRM_WV_MOD_ERROR_DATA_SIZE_TOO_LARGE,
     DRM_WV_MOD_ERROR_RETURN_BUFFER_TOO_SMALL,
     DRM_WV_MOD_ERROR_DMA_DATA_SIZE_TOO_LARGE,
     DRM_WV_MOD_ERROR_NONCE_GENERATION_FAILURE,
@@ -74,15 +74,7 @@
     DRM_WV_MOD_ERROR_INVALID_USAGE_TABLE_GENERATION_NUM,
     DRM_WV_MOD_ERROR_INVALID_USAGE_TABLE_MAGIC,
     DRM_WV_MOD_ERROR_USAGE_TABLE_NOT_INITIALIZED,
-    DRM_WV_MOD_ERROR_INVALID_CIPHER_MODE,
-    DRM_WV_MOD_ERROR_GENERATION_NUM_SKEW,
-    DRM_WV_MOD_WARNING_GENERATION_NUM_SKEW,
-    DRM_WV_MOD_ERROR_ENTRY_IN_USE,
-    DRM_WV_MOD_ERROR_ENTRY_NEEDS_UPDATE,
-    DRM_WV_MOD_ERROR_ANALOG_OUTPUT,
-    DRM_WV_MOD_ERROR_WRONG_PST,
-    DRM_WV_MOD_ERROR_MISSING_MASTER,
-    DRM_WV_MOD_ERROR_LICENSE_INACTIVE
+    DRM_WV_MOD_ERROR_INVALID_CIPHER_MODE
 };
 
 #endif
diff --git a/DRM/cc54/inc/wv_mod_oem_crypto.h b/DRM/cc54/inc/wv_mod_oem_crypto.h
index bdba935..42ed033 100755
--- a/DRM/cc54/inc/wv_mod_oem_crypto.h
+++ b/DRM/cc54/inc/wv_mod_oem_crypto.h
@@ -32,16 +32,6 @@
     DRM_WV_MOD_RSA_PADDING_SCHEME_MAX_VALUE
 };
 
-enum drm_wv_mod_usage_entry_status
-{
-    k_free = -1,
-    k_unused = 0,
-    k_active = 1,
-    k_inactive = 2, // deprecated in v13
-    k_inactive_used = 3,
-    k_inactive_unused = 4
-};
-
 struct drm_wv_mod_key_object
 {
     const uint8_t *key_id;