may anyone explain this script

[Command3r 2]

Hi, i was searching for "how to decrypt windows xp serial", and i found this script:

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Dim $Bin
$Bin = RegRead("HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion","DigitalProductID")

InputBox("Product Key", "Your " & @OSVERSION & " product key is:", DecodeProductKey($bin), "", -1, 100, -1, -1)


Func DecodeProductKey($BinaryDPID)
   Local $bKey[15]
   Local $sKey[29]
   Local $Digits[24]
   Local $Value = 0
   Local $hi = 0
   local $n = 0
   Local $i = 0
   Local $dlen = 29
   Local $slen = 15
   Local $Result

   $Digits = StringSplit("BCDFGHJKMPQRTVWXY2346789","")

   $binaryDPID = stringmid($binaryDPID,105,30)

   For $i = 1 to 29 step 2
       $bKey[int($i / 2)] = dec(stringmid($binaryDPID,$i,2))
   next

   For $i = $dlen -1 To 0 Step -1
       If Mod(($i + 1), 6) = 0 Then
           $sKey[$i] = "-"
       Else
           $hi = 0
           For $n = $slen -1 To 0 Step -1
               $Value = Bitor(bitshift($hi ,- 8) , $bKey[$n])
               $bKey[$n] = int($Value / 24)
               $hi = mod($Value , 24)
           Next
           $sKey[$i] = $Digits[$hi +1]
       EndIf

   Next
   For $i = 0 To 28
       $Result = $Result & $sKey[$i]
   Next

   Return $Result
EndFunc

in this , the script working well !!

i want to know how it's working, need someone to explain every line's code.

thanks

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