为什么用磁盘序列号加密过的代码不能被复制安装？

default.asp
＜html＞
＜head＞
＜title＞星河影动之磁盘序列号加密代码存取管理＜/title＞
＜/head＞
＜% dim conn,fs,f
Set conn = Server.CreateObject("ADODB.Connection")
conn.open "driver={Microsoft Access Driver (*.mdb)};uid=;pwd=3302;dbq="&server.mappath("id.mdb")
set fs=server.createObject("scripting.filesystemobject")
testDrive=Server.MapPath("/DRIVEINFO.ASP")
' 通过MapPath获得当前盘盘符.
testDrive=Left(testDrive,3)
set f=fs.getdrive(testDrive)
' 调用GetDrive方法赋予驱动器一个变量.
Mysql="select * From driveinfo where id=1"
set rsCheck = Server.CreateObject("ADODB.Recordset")
rsCheck.open Mysql,conn,1,1
FSER=trim(f.serialnumber)
' 获得当前盘序列号.
StrSerno=trim(rsCheck.fields("SERNO"))
StrMark=rsCheck.fields("WRIMARK")<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

' Wrimark值为0表示代表合法用户未安装系统,值为1代表该系统已安装.值为1且序列号与当前盘不符时,则判定为非法复制用户
if StrSerno＜＞FSER and StrMark=0 then
' 如是第一次安装,则设置写盘标志为1.
session("pass")=true
' 定义用户Session,并设置为全局ASP文档标识变量.
set rsMain = Server.CreateObject("ADODB.Recordset")
Mysql1="update driveinfo SET SERNO="&FSER&", WRIMARK=1"
rsMain.open Mysql1,conn,1,2
response.write("＜a href='success.asp'＞安装成功!欢迎光临随风起舞存取站点!＜/a＞"＝
set rsMain=nothing
else
if StrSerno=FSER then
' 合法用户可再次进入.
session("pass")=true
response.write("＜a href='success.asp'＞再次欢迎!您已被随风起舞授权,允许进行存取...＜/a＞"＝
else
' 非法复制用户.
session("pass")=false
response.write("＜a href='fail.htm'＞IT IS ILLEGAL TO COPY THE WEBSITE'S ASP DOCUMENT. YOU ARE NOT RIGRT TO  USE THE PROGRAM.＜/a＞"＝
end if
end if
set f=nothing
set fs=nothing
%＞
＜/html＞