matlab加密方式：
http://cn.mathworks.com/matlabcentral/newsreader/view_thread/165381
解密可行性：
https://reverseengineering.stackexchange.com/questions/13918/is-it-possible-to-convert-matlab-p-code-to-something-viewable
在线破译器：
https://sites.google.com/site/sippeyfunlabs/matlab-hacks/please-do-not-secure-your-password-in-matlab-p-code
http://web-service.sippey.org/de_pcode.html
使用时最好用邮件通知这位破解大牛