diff --git a/samples/bigquery_sample/bigquery_v2/bigquery_v2_client.py b/samples/bigquery_sample/bigquery_v2/bigquery_v2_client.py
index afcd1acd..d51b57d7 100644
--- a/samples/bigquery_sample/bigquery_v2/bigquery_v2_client.py
+++ b/samples/bigquery_sample/bigquery_v2/bigquery_v2_client.py
@@ -17,9 +17,9 @@ class BigqueryV2(base_api.BaseApiClient):
   _PACKAGE = u'bigquery'
   _SCOPES = [u'https://www.googleapis.com/auth/bigquery', u'https://www.googleapis.com/auth/bigquery.insertdata', u'https://www.googleapis.com/auth/cloud-platform', u'https://www.googleapis.com/auth/cloud-platform.read-only', u'https://www.googleapis.com/auth/devstorage.full_control', u'https://www.googleapis.com/auth/devstorage.read_only', u'https://www.googleapis.com/auth/devstorage.read_write']
   _VERSION = u'v2'
-  _CLIENT_ID = '1042881264118.apps.googleusercontent.com'
-  _CLIENT_SECRET = 'x_Tw5K8nnjoRAqULM9PFAC2b'
-  _USER_AGENT = 'x_Tw5K8nnjoRAqULM9PFAC2b'
+  _CLIENT_ID = None
+  _CLIENT_SECRET = None
+  _USER_AGENT = None 
   _CLIENT_CLASS_NAME = u'BigqueryV2'
   _URL_VERSION = u'v2'
   _API_KEY = None
diff --git a/samples/dns_sample/dns_v1/dns_v1_client.py b/samples/dns_sample/dns_v1/dns_v1_client.py
index 19e9ca08..9247f94f 100644
--- a/samples/dns_sample/dns_v1/dns_v1_client.py
+++ b/samples/dns_sample/dns_v1/dns_v1_client.py
@@ -17,9 +17,9 @@ class DnsV1(base_api.BaseApiClient):
   _PACKAGE = u'dns'
   _SCOPES = [u'https://www.googleapis.com/auth/cloud-platform', u'https://www.googleapis.com/auth/cloud-platform.read-only', u'https://www.googleapis.com/auth/ndev.clouddns.readonly', u'https://www.googleapis.com/auth/ndev.clouddns.readwrite']
   _VERSION = u'v1'
-  _CLIENT_ID = '1042881264118.apps.googleusercontent.com'
-  _CLIENT_SECRET = 'x_Tw5K8nnjoRAqULM9PFAC2b'
-  _USER_AGENT = 'x_Tw5K8nnjoRAqULM9PFAC2b'
+  _CLIENT_ID = None
+  _CLIENT_SECRET = None
+  _USER_AGENT = None
   _CLIENT_CLASS_NAME = u'DnsV1'
   _URL_VERSION = u'v1'
   _API_KEY = None
diff --git a/samples/fusiontables_sample/fusiontables_v1/fusiontables_v1_client.py b/samples/fusiontables_sample/fusiontables_v1/fusiontables_v1_client.py
index 08c5b5fc..19a7bc19 100644
--- a/samples/fusiontables_sample/fusiontables_v1/fusiontables_v1_client.py
+++ b/samples/fusiontables_sample/fusiontables_v1/fusiontables_v1_client.py
@@ -17,9 +17,9 @@ class FusiontablesV1(base_api.BaseApiClient):
   _PACKAGE = u'fusiontables'
   _SCOPES = [u'https://www.googleapis.com/auth/fusiontables', u'https://www.googleapis.com/auth/fusiontables.readonly']
   _VERSION = u'v1'
-  _CLIENT_ID = '1042881264118.apps.googleusercontent.com'
-  _CLIENT_SECRET = 'x_Tw5K8nnjoRAqULM9PFAC2b'
-  _USER_AGENT = 'x_Tw5K8nnjoRAqULM9PFAC2b'
+  _CLIENT_ID = None
+  _CLIENT_SECRET = None
+  _USER_AGENT = None
   _CLIENT_CLASS_NAME = u'FusiontablesV1'
   _URL_VERSION = u'v1'
   _API_KEY = None
diff --git a/samples/iam_sample/iam_v1/iam_v1_client.py b/samples/iam_sample/iam_v1/iam_v1_client.py
index 65c4f4b1..ebfc6b16 100644
--- a/samples/iam_sample/iam_v1/iam_v1_client.py
+++ b/samples/iam_sample/iam_v1/iam_v1_client.py
@@ -17,9 +17,9 @@ class IamV1(base_api.BaseApiClient):
   _PACKAGE = u'iam'
   _SCOPES = [u'https://www.googleapis.com/auth/cloud-platform']
   _VERSION = u'v1'
-  _CLIENT_ID = '1042881264118.apps.googleusercontent.com'
-  _CLIENT_SECRET = 'x_Tw5K8nnjoRAqULM9PFAC2b'
-  _USER_AGENT = 'x_Tw5K8nnjoRAqULM9PFAC2b'
+  _CLIENT_ID = None
+  _CLIENT_SECRET = None
+  _USER_AGENT = None
   _CLIENT_CLASS_NAME = u'IamV1'
   _URL_VERSION = u'v1'
   _API_KEY = None
diff --git a/samples/servicemanagement_sample/servicemanagement_v1/servicemanagement_v1_client.py b/samples/servicemanagement_sample/servicemanagement_v1/servicemanagement_v1_client.py
index 1b3f5d4f..8c7728a7 100644
--- a/samples/servicemanagement_sample/servicemanagement_v1/servicemanagement_v1_client.py
+++ b/samples/servicemanagement_sample/servicemanagement_v1/servicemanagement_v1_client.py
@@ -17,9 +17,9 @@ class ServicemanagementV1(base_api.BaseApiClient):
   _PACKAGE = u'servicemanagement'
   _SCOPES = [u'https://www.googleapis.com/auth/cloud-platform', u'https://www.googleapis.com/auth/service.management']
   _VERSION = u'v1'
-  _CLIENT_ID = '1042881264118.apps.googleusercontent.com'
-  _CLIENT_SECRET = 'x_Tw5K8nnjoRAqULM9PFAC2b'
-  _USER_AGENT = 'x_Tw5K8nnjoRAqULM9PFAC2b'
+  _CLIENT_ID = None
+  _CLIENT_SECRET = None
+  _USER_AGENT = None
   _CLIENT_CLASS_NAME = u'ServicemanagementV1'
   _URL_VERSION = u'v1'
   _API_KEY = None
diff --git a/samples/storage_sample/storage_v1/storage_v1_client.py b/samples/storage_sample/storage_v1/storage_v1_client.py
index e054871f..3bc732db 100644
--- a/samples/storage_sample/storage_v1/storage_v1_client.py
+++ b/samples/storage_sample/storage_v1/storage_v1_client.py
@@ -17,9 +17,9 @@ class StorageV1(base_api.BaseApiClient):
   _PACKAGE = u'storage'
   _SCOPES = [u'https://www.googleapis.com/auth/cloud-platform', u'https://www.googleapis.com/auth/cloud-platform.read-only', u'https://www.googleapis.com/auth/devstorage.full_control', u'https://www.googleapis.com/auth/devstorage.read_only', u'https://www.googleapis.com/auth/devstorage.read_write']
   _VERSION = u'v1'
-  _CLIENT_ID = '1042881264118.apps.googleusercontent.com'
-  _CLIENT_SECRET = 'x_Tw5K8nnjoRAqULM9PFAC2b'
-  _USER_AGENT = 'x_Tw5K8nnjoRAqULM9PFAC2b'
+  _CLIENT_ID = None
+  _CLIENT_SECRET = None
+  _USER_AGENT = None
   _CLIENT_CLASS_NAME = u'StorageV1'
   _URL_VERSION = u'v1'
   _API_KEY = None