function Get-WindowsKey {
     ## function to retrieve the Windows Product Key from any PC
     ## by Jakob Bindslet (
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 )
     param ($targets = ".")
     $hklm = 2147483650
     $regPath = "Software\Microsoft\Windows NT\CurrentVersion"
     $regValue = "DigitalProductId4"
     Foreach ($target in $targets) {
         $productKey = $null
         $win32os = $null
         $wmi = [WMIClass]"\\$target\root\default:stdRegProv"
         $data = $wmi.GetBinaryValue($hklm,$regPath,$regValue)
         $binArray = ($data.uValue)[52..66]
         $charsArray = "B","C","D","F","G","H","J","K","M","P","Q","R","T","V","W","X","Y","2","3","4","6","7","8","9"
         ## decrypt base24 encoded binary data
         For ($i = 24; $i -ge 0; $i--) {
             $k = 0
             For ($j = 14; $j -ge 0; $j--) {
                 $k = $k * 256 -bxor $binArray[$j]
                 $binArray[$j] = [math]::truncate($k / 24)
                 $k = $k % 24
             }
             $productKey = $charsArray[$k] + $productKey
             If (($i % 5 -eq 0) -and ($i -ne 0)) {
                 $productKey = "-" + $productKey
             }
         }
         $win32os = Get-WmiObject Win32_OperatingSystem -computer $target
         $obj = New-Object Object
         $obj | Add-Member Noteproperty Computer -value $target
         $obj | Add-Member Noteproperty Caption -value $win32os.Caption
         $obj | Add-Member Noteproperty CSDVersion -value $win32os.CSDVersion
         $obj | Add-Member Noteproperty OSArch -value $win32os.OSArchitecture
         $obj | Add-Member Noteproperty BuildNumber -value $win32os.BuildNumber
         $obj | Add-Member Noteproperty RegisteredTo -value $win32os.RegisteredUser
         $obj | Add-Member Noteproperty ProductID -value $win32os.SerialNumber
         $obj | Add-Member Noteproperty ProductKey -value $productkey
         $obj
     }
 }
 
 Get-WindowsKey "SERVERNAME"