场景：有时候自己编写的程序不想被别人带走使用，想着自己的成果在自己的电脑上使用。

原理：生成一个依据CPU序列号和本人自设字符串共同加密的摘要，保存key文件在本地。每次运行自己的程序时检验key文件的摘要和本地机器运算的摘要是否一致，不一致就认为不是你允许的计算机而退出程序。
使用办法：
AUTHOR='52pj'是个人自设字符串
KEYFILENAME='./RegisterKey.key'是生成key文件的摘要
生成文件的调用方法：BuildRegisterKey()
验证key的调用发放：BuildRegisterKey()

Python 代码：【复制】 
import wmi
import hashlib
import os
 
AUTHOR='52pj'
KEYFILENAME='./RegisterKey.key'
 
#获取CPU的序列号加上Author字段，MD5一次，再在结果加上Author字段再MD5一次，形成最终的比较密码
def GetLocalMachineEncrypedString():
    try:
        c = wmi.WMI()
        decryptString = c.win32_Processor()[0].ProcessorId.strip() + AUTHOR
        encrypedString = hashlib.md5(decryptString.encode('utf-8')).hexdigest()
        decryptString = encrypedString + AUTHOR
        encrypedString = hashlib.md5(decryptString.encode('utf-8')).hexdigest()
    except:
        encrypedString = hashlib.md5(AUTHOR.encode('utf-8')).hexdigest()
    return encrypedString
 
#文件中储存的Key是CPU序列号加Author，一次MD5结果
def GetKeyFromFile():
    try:
        f=open(KEYFILENAME,'r')
        lines=f.readlines()
        keyString=lines[0]
        return keyString
    except:
        return ''
 
#把文件的key加上author，做最后一次MD5生成最终结果
def CheckIsRegistered():
    decryptString=GetKeyFromFile()+AUTHOR
    encrypedString = hashlib.md5(decryptString.encode('utf-8')).hexdigest()
    if encrypedString==GetLocalMachineEncrypedString():
        return True
    else:
        return False
 
#生成key文件
def BuildRegisterKey():
    try:
        c = wmi.WMI()
        decryptString = c.win32_Processor()[0].ProcessorId.strip() + AUTHOR
        encrypedString = hashlib.md5(decryptString.encode('utf-8')).hexdigest()
    except:
        encrypedString=''
 
    try:
        f=os.open(KEYFILENAME,os.O_CREAT|os.O_WRONLY)
        os.write(f,encrypedString.encode('utf-8'))
        print('写入', KEYFILENAME, '成功')
    except:
        print('写入',KEYFILENAME,'失败')
 
def BuildRegisterKey(decryptString):
    if decryptString:
        decryptString = decryptString + AUTHOR
        encrypedString = hashlib.md5(decryptString.encode('utf-8')).hexdigest()
    else:
        encrypedString=''
 
    try:
        f=os.open(KEYFILENAME,os.O_CREAT|os.O_WRONLY)
        os.write(f,encrypedString.encode('utf-8'))
        print('写入', KEYFILENAME, '成功')
    except:
        print('写入',KEYFILENAME,'失败')
 
def ShowCPUSerialNumber():
    try:
        c = wmi.WMI()
        decryptString = c.win32_Processor()[0].ProcessorId.strip()
    except:
        decryptString=''
    return decryptString