diff --git a/pkg/assertutil/assertutil.go b/pkg/assertutil/assertutil.go
index 432546eb2682..d750b63a7aa7 100644
--- a/pkg/assertutil/assertutil.go
+++ b/pkg/assertutil/assertutil.go
@@ -8,6 +8,7 @@
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
diff --git a/pkg/assertutil/assertutil_test.go b/pkg/assertutil/assertutil_test.go
index 5ea964ffa09b..754af4509e2a 100644
--- a/pkg/assertutil/assertutil_test.go
+++ b/pkg/assertutil/assertutil_test.go
@@ -8,6 +8,7 @@
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
diff --git a/pkg/encryption/config_test.go b/pkg/encryption/config_test.go
index 8caa0de14a71..49a04f0cd46c 100644
--- a/pkg/encryption/config_test.go
+++ b/pkg/encryption/config_test.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/pkg/encryption/crypter.go b/pkg/encryption/crypter.go
index 924ee04f514b..16de0500f925 100644
--- a/pkg/encryption/crypter.go
+++ b/pkg/encryption/crypter.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/pkg/encryption/crypter_test.go b/pkg/encryption/crypter_test.go
index 652d5c0cdafc..5bdd20a831d1 100644
--- a/pkg/encryption/crypter_test.go
+++ b/pkg/encryption/crypter_test.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/pkg/encryption/master_key.go b/pkg/encryption/master_key.go
index ab7f8a23a644..31d9a0cb5915 100644
--- a/pkg/encryption/master_key.go
+++ b/pkg/encryption/master_key.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/pkg/encryption/master_key_test.go b/pkg/encryption/master_key_test.go
index c0af34b21a2e..b70bf271d0ce 100644
--- a/pkg/encryption/master_key_test.go
+++ b/pkg/encryption/master_key_test.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/pkg/encryption/region_crypter.go b/pkg/encryption/region_crypter.go
index d4cd93b78395..3f85cd491ca1 100644
--- a/pkg/encryption/region_crypter.go
+++ b/pkg/encryption/region_crypter.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/pkg/encryption/region_crypter_test.go b/pkg/encryption/region_crypter_test.go
index e4c95d0adb7c..ac7bd34a7b18 100644
--- a/pkg/encryption/region_crypter_test.go
+++ b/pkg/encryption/region_crypter_test.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/api/hot_status.go b/server/api/hot_status.go
index 6a8d4485ae1c..84aa38916974 100644
--- a/server/api/hot_status.go
+++ b/server/api/hot_status.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/api/region_label.go b/server/api/region_label.go
index 6330bea0b887..155ef063f4d7 100644
--- a/server/api/region_label.go
+++ b/server/api/region_label.go
@@ -8,6 +8,7 @@
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
diff --git a/server/api/region_label_test.go b/server/api/region_label_test.go
index c0dafb8575d2..f3b8ef3e5ae0 100644
--- a/server/api/region_label_test.go
+++ b/server/api/region_label_test.go
@@ -8,6 +8,7 @@
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
diff --git a/server/api/version.go b/server/api/version.go
index 43ebf25c9161..eb6d54c040d6 100644
--- a/server/api/version.go
+++ b/server/api/version.go
@@ -1,3 +1,17 @@
+// Copyright 2021 TiKV Project Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package api
 
 import (
diff --git a/server/cluster/cluster_stat.go b/server/cluster/cluster_stat.go
index 454e1a1cdae4..aa0f42e232dd 100644
--- a/server/cluster/cluster_stat.go
+++ b/server/cluster/cluster_stat.go
@@ -10,7 +10,7 @@
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
-// limitations under the License
+// limitations under the License.
 
 package cluster
 
diff --git a/server/cluster/cluster_stat_test.go b/server/cluster/cluster_stat_test.go
index 5d824e9ef786..0b2a094b5b3e 100644
--- a/server/cluster/cluster_stat_test.go
+++ b/server/cluster/cluster_stat_test.go
@@ -10,7 +10,7 @@
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
-// limitations under the License
+// limitations under the License.
 
 package cluster
 
diff --git a/server/cluster/coordinator.go b/server/cluster/coordinator.go
index dc217dcf2926..56871678e3d4 100644
--- a/server/cluster/coordinator.go
+++ b/server/cluster/coordinator.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/cluster/coordinator_test.go b/server/cluster/coordinator_test.go
index 82ef85993581..14c8df538821 100644
--- a/server/cluster/coordinator_test.go
+++ b/server/cluster/coordinator_test.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/cluster/store_limiter.go b/server/cluster/store_limiter.go
index b3978b954801..8241965e8483 100644
--- a/server/cluster/store_limiter.go
+++ b/server/cluster/store_limiter.go
@@ -10,7 +10,7 @@
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
-// limitations under the License
+// limitations under the License.
 
 package cluster
 
diff --git a/server/cluster/store_limiter_test.go b/server/cluster/store_limiter_test.go
index 2629706161cc..d23bdb065364 100644
--- a/server/cluster/store_limiter_test.go
+++ b/server/cluster/store_limiter_test.go
@@ -10,7 +10,7 @@
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
-// limitations under the License
+// limitations under the License.
 
 package cluster
 
diff --git a/server/core/region_storage.go b/server/core/region_storage.go
index b60d0ac0b62a..ea79fbae099c 100644
--- a/server/core/region_storage.go
+++ b/server/core/region_storage.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/core/storage.go b/server/core/storage.go
index c0a39acfc231..da9ef691322e 100644
--- a/server/core/storage.go
+++ b/server/core/storage.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/core/storage_test.go b/server/core/storage_test.go
index 69d76ed350bf..6d772deffe5d 100644
--- a/server/core/storage_test.go
+++ b/server/core/storage_test.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/encryptionkm/key_manager_test.go b/server/encryptionkm/key_manager_test.go
index ffa1d535fb73..c307b1aea61c 100644
--- a/server/encryptionkm/key_manager_test.go
+++ b/server/encryptionkm/key_manager_test.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/handler.go b/server/handler.go
index eb4b3d85fabe..fa90cbb5d9e1 100644
--- a/server/handler.go
+++ b/server/handler.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/kv/etcd_kv.go b/server/kv/etcd_kv.go
index d9c2cc11a0cf..06e62a18ef7c 100644
--- a/server/kv/etcd_kv.go
+++ b/server/kv/etcd_kv.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/kv/kv.go b/server/kv/kv.go
index 9a33f86430d0..2f1fa06e1440 100644
--- a/server/kv/kv.go
+++ b/server/kv/kv.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/kv/kv_test.go b/server/kv/kv_test.go
index 2b19e168fbfc..e1359b04e2c9 100644
--- a/server/kv/kv_test.go
+++ b/server/kv/kv_test.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/kv/levedb_kv.go b/server/kv/levedb_kv.go
index 1b3169ff9dee..e5b45c153113 100644
--- a/server/kv/levedb_kv.go
+++ b/server/kv/levedb_kv.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/kv/mem_kv.go b/server/kv/mem_kv.go
index a314678882f8..b20fead03d21 100644
--- a/server/kv/mem_kv.go
+++ b/server/kv/mem_kv.go
@@ -4,7 +4,7 @@
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
-//	   http://www.apache.org/licenses/LICENSE-2.0
+//     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
diff --git a/server/schedule/region_scatterer_test.go b/server/schedule/region_scatterer_test.go
index 4c5e5e7e4199..a9fc762e7e3f 100644
--- a/server/schedule/region_scatterer_test.go
+++ b/server/schedule/region_scatterer_test.go
@@ -1,3 +1,17 @@
+// Copyright 2021 TiKV Project Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package schedule
 
 import (
diff --git a/server/schedulers/utils_test.go b/server/schedulers/utils_test.go
index 4911f667152b..13620ebd1142 100644
--- a/server/schedulers/utils_test.go
+++ b/server/schedulers/utils_test.go
@@ -8,6 +8,7 @@
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
diff --git a/tools/pd-recover/main.go b/tools/pd-recover/main.go
index 47815f06ed7b..29716bb19d49 100644
--- a/tools/pd-recover/main.go
+++ b/tools/pd-recover/main.go
@@ -1,3 +1,17 @@
+// Copyright 2021 TiKV Project Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package main
 
 import (
diff --git a/tools/pd-simulator/simulator/config.go b/tools/pd-simulator/simulator/config.go
index ecd6cc5095bc..e92f740b21f6 100644
--- a/tools/pd-simulator/simulator/config.go
+++ b/tools/pd-simulator/simulator/config.go
@@ -1,3 +1,17 @@
+// Copyright 2021 TiKV Project Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package simulator
 
 import (
diff --git a/tools/regions-dump/main.go b/tools/regions-dump/main.go
index 48ed65e9dc8c..704b20d92485 100644
--- a/tools/regions-dump/main.go
+++ b/tools/regions-dump/main.go
@@ -1,3 +1,17 @@
+// Copyright 2021 TiKV Project Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package main
 
 import (