diff --git a/worker/assign.go b/worker/assign.go
index d74fea052e2b86c97366e08b14fc585812bd2072..99e24525af0eefe61153b539c9f991f54f129811 100644
--- a/worker/assign.go
+++ b/worker/assign.go
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2016 DGraph Labs, Inc.
+ *
+ * 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 worker
 
 import (
diff --git a/worker/assign_test.go b/worker/assign_test.go
index 3905b6398d0601b66c66f3017cbcfe67b21f175e..ee086f2b9efc8312c1d3308c612f86ab40d25c48 100644
--- a/worker/assign_test.go
+++ b/worker/assign_test.go
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2016 DGraph Labs, Inc.
+ *
+ * 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 worker
 
 import (
diff --git a/worker/mutation.go b/worker/mutation.go
index 37d6a4d4a97348b360795d2f657165a68a8155f2..36a6666de0cf72828cf0aae23c1b3b9f6951d36e 100644
--- a/worker/mutation.go
+++ b/worker/mutation.go
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2016 DGraph Labs, Inc.
+ *
+ * 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 worker
 
 import (
diff --git a/worker/task.go b/worker/task.go
index 90a26a9bca692b3a4f666e98578af76e606f7fde..28ab6cc9734f8cf3a65bc5b73d58115fd1b8f747 100644
--- a/worker/task.go
+++ b/worker/task.go
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2016 DGraph Labs, Inc.
+ *
+ * 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 worker
 
 import (
diff --git a/worker/worker.go b/worker/worker.go
index f6816e202398fd99aee47401c70a27ec2f59e3bf..64d1c9e6625f9b8d7c8f94f4a482ec9ca47583bd 100644
--- a/worker/worker.go
+++ b/worker/worker.go
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2016 DGraph Labs, Inc.
+ *
+ * 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 worker
 
 import (
diff --git a/worker/worker_test.go b/worker/worker_test.go
index e16a6f81ea57b27a654cb30e71d830fd38978ccf..f879efac7e3274be107918654072201170392b2b 100644
--- a/worker/worker_test.go
+++ b/worker/worker_test.go
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2016 DGraph Labs, Inc.
+ *
+ * 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 worker
 
 import (
diff --git a/x/heap_test.go b/x/heap_test.go
index 6f9241e08e9234aedfadf6fb713dd4bf24967cdd..852238d83d74cf7203d2e0012895a68c0cf42056 100644
--- a/x/heap_test.go
+++ b/x/heap_test.go
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2016 DGraph Labs, Inc.
+ *
+ * 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 x
 
 import (
diff --git a/x/x.go b/x/x.go
index 2ae25556b65d41f68cb9659acbb58cdc54924931..c9213f07a29d4f2daf469c08d043689fa831ae9b 100644
--- a/x/x.go
+++ b/x/x.go
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2016 DGraph Labs, Inc.
+ *
+ * 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 x
 
 import (