diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 71ed16afa1438fb86d058a1a10f84ba1d279c152..04bc61ed9e1ca0eb0480bc13d1a9731827e0239e 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -19,5 +19,5 @@ ADD_SUBDIRECTORY(wal)
 ADD_SUBDIRECTORY(cq)
 ADD_SUBDIRECTORY(dnode)
 #ADD_SUBDIRECTORY(connector/odbc)
-#ADD_SUBDIRECTORY(connector/jdbc)
+ADD_SUBDIRECTORY(connector/jdbc)
 
diff --git a/src/os/inc/eok.h b/src/os/inc/eok.h
index a0fd5b5d8e15ee9722e3ad4b6c29d5a432053174..4d38e8e6328fb230441349ce7e19ab458d114243 100644
--- a/src/os/inc/eok.h
+++ b/src/os/inc/eok.h
@@ -1,3 +1,18 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #ifndef _eok_h_fd274616_996c_400e_9023_ae70be881fa3_
 #define _eok_h_fd274616_996c_400e_9023_ae70be881fa3_
 
diff --git a/src/os/src/darwin/eok.c b/src/os/src/darwin/eok.c
index 322aa7cf86b6bfd149b9eb30b1dc5668f26b2935..f9465d29dd34304ee6a519ee574c2a76e5ba684a 100644
--- a/src/os/src/darwin/eok.c
+++ b/src/os/src/darwin/eok.c
@@ -1,3 +1,18 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #include "eok.h"
 
 #include <errno.h>
diff --git a/tests/examples/c/epoll.c b/tests/examples/c/epoll.c
index 6047c9e4eac3e30f943e132e57a317d68657ee20..1ef9b3eddffd0ebad549e91264cad95514735d9b 100644
--- a/tests/examples/c/epoll.c
+++ b/tests/examples/c/epoll.c
@@ -1,3 +1,18 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #ifdef __APPLE__
 #include "eok.h"
 #else