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@ -32,7 +32,7 @@ The following sections provide a comprehensive list of BitLocker Group Policy se
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The following policy settings can be used to determine how a BitLocker-protected drive can be unlocked.
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- [Allow devices with Secure Boot and protect DMS ports to opt out of preboot PIN](#bkmk-hstioptout)
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- [Allow devices with Secure Boot and protect DMA ports to opt out of preboot PIN](#bkmk-hstioptout)
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- [Allow network unlock at startup](#bkmk-netunlock)
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- [Require additional authentication at startup](#bkmk-unlockpol1)
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- [Allow enhanced PINs for startup](#bkmk-unlockpol2)
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@ -86,7 +86,7 @@ The following policies are used to support customized deployment scenarios in yo
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- [Allow access to BitLocker-protected fixed data drives from earlier versions of Windows](#bkmk-depopt4)
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- [Allow access to BitLocker-protected removable data drives from earlier versions of Windows](#bkmk-depopt5)
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### <a href="" id="bkmk-hstioptout"></a>Allow devices with Secure Boot and protect DMS ports to opt out of preboot PIN
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### <a href="" id="bkmk-hstioptout"></a>Allow devices with Secure Boot and protect DMA ports to opt out of preboot PIN
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This policy setting allows users on devices that are compliant with InstantGo or the Microsoft Hardware Security Test Interface (HSTI) to not have a PIN for preboot authentication.
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@ -137,7 +137,8 @@ This setting enables an exception to the PIN-required policy on secure hardware.
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### <a href="" id="bkmk-netunlock"></a>Allow network unlock at startup
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This policy controls a portion of the behavior of the Network Unlock feature in BitLocker. This policy is required to enable BitLocker Network Unlock on a network because it allows clients running BitLocker to create the necessary network key protector during encryption. This policy is used in addition to the BitLocker Drive Encryption Network Unlock Certificate security policy (located in the **Public Key Policies** folder of Local Computer Policy) to allow systems that are connected to a trusted network to properly utilize the Network Unlock feature.
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This policy controls a portion of the behavior of the Network Unlock feature in BitLocker. This policy is required to enable BitLocker Network Unlock on a network because it allows clients running BitLocker to create the necessary network key protector during encryption.
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This policy is used in addition to the BitLocker Drive Encryption Network Unlock Certificate security policy (located in the **Public Key Policies** folder of Local Computer Policy) to allow systems that are connected to a trusted network to properly utilize the Network Unlock feature.
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<table>
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<colgroup>
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@ -144,7 +144,7 @@ reg add "HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard" /v "EnableVirtualiza
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reg add "HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard" /v "RequirePlatformSecurityFeatures" /t REG_DWORD /d 1 /f
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```
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> To enable **VBS with Secure Boot and DMA (value 2)**, in the preceding command, change **/d 1** to **/d 2**.
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> To enable **VBS with Secure Boot and DMA (value 3)**, in the preceding command, change **/d 1** to **/d 3**.
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**To enable VBS without UEFI lock (value 0)**
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@ -196,7 +196,7 @@ reg add "HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard" /v "EnableVirtualiza
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reg add "HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard" /v "RequirePlatformSecurityFeatures" /t REG_DWORD /d 1 /f
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```
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> To enable **VBS with Secure Boot and DMA (value 2)**, in the preceding command, change **/d 1** to **/d 2**.
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> To enable **VBS with Secure Boot and DMA (value 3)**, in the preceding command, change **/d 1** to **/d 3**.
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**To enable virtualization-based protection of Code Integrity policies (with the default, UEFI lock)**
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@ -112,7 +112,7 @@ Membership in the local Administrators group, or equivalent, is the minimum requ
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5. After the PC restarts, your TPM will be automatically prepared for use by Windows 10.
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## <a href="" id="turn-on-or-turn-off"></a>Turn on or turn off the TPM (TPM 1.2 with Windows 10, version 1507 or 1511)
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## <a href="" id="turn-on-or-turn-off"></a>Turn on or turn off the TPM (available only with TPM 1.2 with Windows 10, version 1507 or 1511)
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Normally, the TPM is turned on as part of the TPM initialization process. You do not normally need to turn the TPM on or off. However, if necessary you can do so by using the TPM MMC.
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@ -148,9 +148,9 @@ If you want to stop using the services that are provided by the TPM, you can use
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- If you did not save your TPM owner password or no longer know it, click **I do not have the TPM owner password**, and follow the instructions that are provided in the dialog box and subsequent UEFI screens to turn off the TPM without entering the password.
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### Change the TPM Owner Password (Windows 10, version 1607 or earlier only)
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### Change the TPM Owner Password (available only with Windows 10, version 1607 and earlier versions)
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If you have the owner password available, see [Change the TPM Owner Password](https://technet.microsoft.com/en-us/itpro/windows/keep-secure/change-the-tpm-owner-password), you can use TPM.msc to change the TPM Owner Password.
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If you have the [owner password](https://technet.microsoft.com/itpro/windows/keep-secure/change-the-tpm-owner-password) available, you can use TPM.msc to change the TPM Owner Password.
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1. Open the TPM MMC (tpm.msc).
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