[GNU百度百科:http://baike.baidu.com/link?url=nUbxJSHZ8g_UnEURXFWMOwvB9s3Y-7BwvwWeRgt51iohU_9jsf-mJm3BL0JKVUa_j955Ds0xEdLVGJsWQs4mla]
[GPL:http://baike.baidu.com/view/130692.htm]