diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..7e40488
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,37 @@
+The Star And Thank Author License (SATA)
+
+Copyright (c) <Qingdao University Online Judge Dev Team> <info@qduoj.com>
+
+Project Url: https://github.com/QingdaoU/OnlineJudge
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+And wait, the most important, you shall star/+1/like the project(s) in project url
+section above first, and then thank the author(s) in Copyright section.
+
+Here are some suggested ways:
+
+ - Email the authors a thank-you letter, and make friends with him/her/them.
+ - Report bugs or issues.
+ - Tell friends what a wonderful project this is.
+ - And, sure, you can just express thanks in your mind without telling the world.
+
+Contributors of this project by forking have the option to add his/her name and
+forked project url at copyright and project url sections, but shall not delete
+or modify anything else in these two sections.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
\ No newline at end of file
diff --git a/README.md b/README.md
index 8f7e231..7ec4099 100644
--- a/README.md
+++ b/README.md
@@ -9,12 +9,12 @@ sudo apt-get install libseccomp-dev
 mkdir build && cd build && cmake .. && make && sudo make install
 ```
 
-
 ## C API
 
 `#include <runner.h>` then call `run` function with `struct config` and `struct result` pointer.
 
 ## `struct config` members
+
  - `max_cpu_time`(ms):  max cpu time this process can cost, -1 for unlimited
  - `max_real_time`(ms):  max time this process can run, -1 for unlimited
  - `max_memory`(byte):  max size of the process's virtual memory (address space), -1 for unlimited
@@ -85,7 +85,7 @@ cd tests &&  sudo python test.py
  - Linux x64 and kernel version > 3.17 required
  - Judger security relies on Docker with default security config [More](todo)
  - Tested under Ubuntu 14.04 docker container. System calls may vary due to different system and kernel versions
- - Root user required to run judger
+ - Root user required to change uid / gid
  - Why use seccomp instead of ptrace? Ptrace can decrease process's performance significantly, for each system call, twice 
  context switch between child process and parent process is needed.
  - How to custom seccomp rule? [Example here]()  and then reinstall jduger, your code will be compiled and installed under 
diff --git a/bindings/Python/_judger.c b/bindings/Python/_judger.c
index dfc3337..0752c43 100644
--- a/bindings/Python/_judger.c
+++ b/bindings/Python/_judger.c
@@ -102,8 +102,8 @@ static PyObject *judger_run(PyObject *self, PyObject *args, PyObject *kwargs) {
 
 
 static PyMethodDef judger_methods[] = {
-        {"run", (PyCFunction) judger_run, METH_KEYWORDS, NULL},
-        {NULL, NULL, 0, NULL}
+    {"run", (PyCFunction) judger_run, METH_KEYWORDS, NULL},
+    {NULL, NULL, 0, NULL}
 };