package com;

import java.io.*;
import java.text.*;
import java.util.Calendar;

public class Myeclipse5_5_0_KeyMaker
{

//    private static final String L = "Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself.";

   public Myeclipse5_5_0_KeyMaker()
   {

   }

   public static void main(String args[])
   {
   //System.
       BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
       String userId = null;
       int intLicenseNum = 1;
       String strLicenseNum = null;
       boolean bProFlag = true;
       String strProFlag = null;
       while(userId == null || "".equals(userId.trim()))
       {
           System.out.print("Subscriber: ");
           try
           {
               userId = br.readLine();
           }
           catch(IOException ioexception) { }
       }

       System.out.print("Number of licenses(default 1, max 999): ");
       try
       {
           strLicenseNum = br.readLine();
       }
       catch(IOException ioexception1) { }
       NumberFormat nf = new DecimalFormat("000");
       if(strLicenseNum == null || "".equals(strLicenseNum.trim()))
           strLicenseNum = nf.format(intLicenseNum);
       else
           strLicenseNum = nf.format(Integer.parseInt(strLicenseNum));
       System.out.print("Professional or Standard(default pro, n=stand): ");
       try
       {
           strProFlag = br.readLine();
       }
       catch(IOException ioexception2) { }
       if(strProFlag != null && !"".equals(strProFlag.trim()))
           bProFlag = false;
       Calendar cal = Calendar.getInstance();
       cal.add(1, 2);
       cal.add(6, -1);
       SimpleDateFormat sdf = new SimpleDateFormat("yyMMdd");
       String need = userId.substring(0, 1) + "Y" + (bProFlag ? "E3MP" : "E2MY") + "-100" + strLicenseNum + "-" + sdf.format(cal.getTime()) + "0";
       String dx = need + "Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself." + userId;
       int suf = decode(dx);
       String code = need + suf;
       System.out.println("Subscription Code: " + change(code));
   }

   static int decode(String s)
   {
       int i = 0;
       char ac[] = s.toCharArray();
       int j = 0;
       for(int k = ac.length; j < k; j++)
           i = 31 * i + ac[j];

       return Math.abs(i);
   }

   static String change(String s)
   {
       if(s == null || s.length() == 0)
           return s;
       byte abyte0[] = s.getBytes();
       char ac[] = new char[s.length()];
       int i = 0;
       for(int k = abyte0.length; i < k; i++)
       {
           int j = abyte0[i];
           if(j >= 48 && j <= 57)
               j = ((j - 48) + 5) % 10 + 48;
           else
           if(j >= 65 && j <= 90)
               j = ((j - 65) + 13) % 26 + 65;
           else
           if(j >= 97 && j <= 122)
               j = ((j - 97) + 13) % 26 + 97;
           ac[i] = (char)j;
       }

       return String.valueOf(ac);
   }
}

第一步：随便创建一Java工程，并新建一个类；把上面代码复制过去；

第二步：运行，并在控制台Subscriber: 后输入任意字符串（例如：hello）回车,再在Number of licenses(default 1, max 999): 后输入1-999之间的任意数字（例如：11）后回车。再输入n回车或者直接回车都可。

此时对应的注册码就会出现。

第三步，断开网络，把刚才输入的字符串和生成的注册码，输入指定的Subscriber和Subscription Code即可