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windows-itpro-docs/windows/security/application-security/application-control/windows-defender-application-control/applocker/merge-applocker-policies-by-using-set-applockerpolicy.md
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Merge AppLocker policies by using Set-ApplockerPolicy This topic for IT professionals describes the steps to merge AppLocker policies by using Windows PowerShell. medium conceptual 09/21/2017

Merge AppLocker policies by using Set-ApplockerPolicy

Note

Some capabilities of Windows Defender Application Control are only available on specific Windows versions. Learn more about the Windows Defender Application Control feature availability.

This topic for IT professionals describes the steps to merge AppLocker policies by using Windows PowerShell.

The Set-AppLockerPolicy cmdlet sets the specified Group Policy Object (GPO) to contain the specified AppLocker policy. If no Lightweight Directory Access Protocol (LDAP) is specified, the local GPO is the default. When the Merge parameter is used, rules in the specified AppLocker policy will be merged with the AppLocker rules in the target GPO specified in the LDAP path. The merging of policies will remove rules with duplicate rule IDs, and the enforcement setting specified by the AppLocker policy in the target GPO will be preserved. If the Merge parameter isn't specified, then the new policy will overwrite the existing policy.

For info about using Set-AppLockerPolicy, including syntax descriptions and parameters, see Set-AppLockerPolicy.

For info about using Windows PowerShell for AppLocker, including how to import the AppLocker cmdlets into Windows PowerShell, see Use the AppLocker Windows PowerShell cmdlets.

You can also manually merge AppLocker policies. For information on the procedure to do this merging, see Merge AppLocker policies manually.

To merge a local AppLocker policy with another AppLocker policy by using LDAP paths

  1. Open the PowerShell command window. For info about performing Windows PowerShell commands for AppLocker, see Use the AppLocker Windows PowerShell cmdlets.
  2. At the command prompt, type C:\PS>Get-AppLockerPolicy -Local | Set-AppLockerPolicy -LDAP "LDAP: //<string>" -Merge where <string> specifies the LDAP path of the unique GPO.

Example

Gets the local AppLocker policy, and then merges the policy with the existing AppLocker policy in the GPO specified in the LDAP path.

C:\PS>Get-AppLockerPolicy -Local | Set-AppLockerPolicy -LDAP "LDAP://DC13.Contoso.com/CN={31B2F340-016D-11D2-945F-00C044FB984F9},CN=Policies,CN=System,DC=Contoso,DC=com" -Merge