Just write the loc name as the key in the policy file

common/lib/xmodule/xmodule/contentstore/mongo.py

@@ -122,7 +122,7 @@ class MongoContentStore(ContentStore):
             self.export(asset_location, output_directory)
             for attr, value in asset.iteritems():
                 if attr not in ['_id', 'md5', 'uploadDate', 'length', 'chunkSize']:
-                    policy.setdefault(asset_location.url(), {})[attr] = value
+                    policy.setdefault(asset_location.name, {})[attr] = value
 
         with open(assets_policy_file, 'w') as f:
             json.dump(policy, f)

common/lib/xmodule/xmodule/modulestore/xml_importer.py

@@ -56,7 +56,7 @@ def import_static_content(modules, course_loc, course_data_path, static_content_
             content_loc = StaticContent.compute_location(target_location_namespace.org, target_location_namespace.course, fullname_with_subpath)
 
 
-            policy_ele = policy.get(content_loc.url(), {})
+            policy_ele = policy.get(content_loc.name, {})
             displayname = policy_ele.get('displayname', filename)
             locked = policy_ele.get('locked', False)
             mime_type = policy_ele.get('contentType', mimetypes.guess_type(filename)[0])