Powershell cmdlet to retrieve product keys and OS information from local or remote system/s.

Retrieves the product key and OS information from a local or remote system/s using WMI and/or ProduKey. Attempts to decode the product key from the registry, shows product keys from SoftwareLicensingProduct (SLP), and attempts to use ProduKey as well. Enables RemoteRegistry service if required. Originally inspired by this script: https://gallery.technet.microsoft.com/scriptcenter/Get-product-keys-of-local-83b4ce97

Note that giving credentials with ProduKey requires running the process locally with those credentials, so they must work on the local machine.

The reason ProduKey was included is because it's great at getting keys SLP doesn't have registered, but as it can't get anything for VLK/MAK, querying SLP (and other WMI classes) is still needed.

.PARAMETER Computername
Strings. Name of the local or remote system/s. You may give multiple computernames.

.PARAMETER ShowOnlyValid
Switch. Output only fully valid entries (pingable, has WMI access).

.PARAMETER DontEnableRemoteRegistry
Switch. Do NOT attempt to enable the RemoteRegistry service if it's disabled.

.PARAMETER SkipRegProductKey
Switch. Skip attempting to decode the product key from the registry (non-VLK/MAK only, requires RemoteRegistry if remote).

.PARAMETER SkipDefaultProductKeys
Switch. Skip attempting to decode the default product keys from the registry.

.PARAMETER SkipOEMInfo
Switch. Skip outputting OEM info from WMI / registry.

.PARAMETER SkipProduKey
Switch. Skip attempting to use ProduKey for additional keys (requires RemoteRegistry access for remote machines).

.PARAMETER ProduKeyPath
String. Path to ProduKey.exe and its working directory. Default: "." (current directory)

.PARAMETER PromptForCredentials
Switch. Prompt for secure credentials to use.

.PARAMETER Credential
Secure credential object to use instead of the current user's credentials.

.EXAMPLE
PS> Get-ProductKey -Computername Computer1

OSDescription : Microsoft Windows 10 Pro
Source : SLP/WMI
ProductKey : XXXXX
Hostname : Computer1
OEMManufacturer : Dell, Inc.
OSVersion : 10.0.17134
ProductID : NNNNN-NNNNN-NNN-NNNNNN-NN-NNNN-NNNNN.NNNN-NNNNNNN
IP : 192.168.1.2
OEMModel : Optiplex 320
SLPLicenseStatus : Licensed
ProductName : Windows(R), Professional edition

OSDescription : Microsoft Windows 10 Pro
Source : ProduKey
ProductKey : XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
Hostname : Computer1
OEMManufacturer : Dell, Inc.
OSVersion : 10.0.17134
ProductID : NNNNN-NNNNN-NNNNN-NNNNN
IP : 192.168.1.2
OEMModel : Optiplex 320
SLPLicenseStatus :
ProductName : Windows 10 Pro