Add license headers to source files
diff --git a/src/couch_stats.app.src b/src/couch_stats.app.src
index 665636e..d710404 100644
--- a/src/couch_stats.app.src
+++ b/src/couch_stats.app.src
@@ -1,3 +1,15 @@
+% 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.
+
{application, couch_stats, [
{description, "Simple statistics collection"},
{vsn, git},
diff --git a/src/couch_stats.erl b/src/couch_stats.erl
index 4668064..e195e82 100644
--- a/src/couch_stats.erl
+++ b/src/couch_stats.erl
@@ -1,3 +1,15 @@
+% 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.
+
-module(couch_stats).
-export([
diff --git a/src/couch_stats_aggregator.erl b/src/couch_stats_aggregator.erl
index 4c7168d..f74403f 100644
--- a/src/couch_stats_aggregator.erl
+++ b/src/couch_stats_aggregator.erl
@@ -1,3 +1,15 @@
+% 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.
+
-module(couch_stats_aggregator).
-behaviour(gen_server).
diff --git a/src/couch_stats_app.erl b/src/couch_stats_app.erl
index e9f7836..78880e3 100644
--- a/src/couch_stats_app.erl
+++ b/src/couch_stats_app.erl
@@ -1,3 +1,15 @@
+% 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.
+
-module(couch_stats_app).
-behaviour(application).
diff --git a/src/couch_stats_process_tracker.erl b/src/couch_stats_process_tracker.erl
index 652d910..5b5b97c 100644
--- a/src/couch_stats_process_tracker.erl
+++ b/src/couch_stats_process_tracker.erl
@@ -1,3 +1,15 @@
+% 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.
+
-module(couch_stats_process_tracker).
-behaviour(gen_server).
diff --git a/src/couch_stats_sup.erl b/src/couch_stats_sup.erl
index 4943826..55755bb 100644
--- a/src/couch_stats_sup.erl
+++ b/src/couch_stats_sup.erl
@@ -1,3 +1,15 @@
+% 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.
+
-module(couch_stats_sup).
-behaviour(supervisor).
