Greg,
If one has a running Win 7 system,
then one could read in the registry hive, extract the reg entry, alter this script and then simply in PowerShell run this function:
Script:
function Get-ProductKey {
$map="BCDFGHJKMPQRTVWXY2346789"
$value = (get-itemproperty "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion").digitalproductid[0x34..0x42]
$ProductKey = ""
for ($i = 24; $i -ge 0; $i--) {
$r = 0
for ($j = 14; $j -ge 0; $j--) {
$r = ($r * 256) -bxor $value[$j]
$value[$j] = [math]::Floor([double]($r/24))
$r = $r % 24 }
$ProductKey = $map[$r] + $ProductKey
if (($i % 5) -eq 0 -and $i -ne 0) { $ProductKey = "-" + $ProductKey }
}
$ProductKey
}
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