Ever wanted to read out the Windows license key? In the Windows Registry, this key is present, but it is stored as a digital ID. To convert it back to the license key used to originally license the product, try this function. It uses some serious math:
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 }