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       tpm_clear  -  return  the  TPM to the default state (unowned, disabled,


       tpm_clear [OPTION]


       tpm_clear requests that the system’s TPM perform a clear (via the
       TPM_OwnerClear API) wiping out all ownership information, in effect
       invalidaing all keys and data tied to the TPM, as well as disabling and
       deactivating the TPM.  This operation will prompt for the owner
       password.  The --force option relies on Phyiscal Presence to authorize
       the command (via the TPM_ForceClear API) skipping the owner password
       prompt.  The TPM OwnerClear API can be disabled until the current owner
       is cleared, requiring use of the --force with tpm_setclearable command.
       The TPM_ForceClear API can be disabled for the current boot cycle with
       the tpm_setclearable command.  This command requires a reboot to
       complete the operation.

       -h, --help
              Display command usage info.

       -v, --version
              Display command version info.

       -l, --log [none|error|info|debug]
              Set logging level.

       -u, --unicode
              Use TSS UNICODE encoding for passwords to comply with
              applications using TSS popup boxes

       -f, --force
              Rely on Physical Presence for authorization; therefore, do not
              prompt for owner password.

       -z, --well-known
              Authenticate using 20 bytes of zeros as owner password (the
              default TSS Well Known Secret), instead of prompting for an
              owner password.


       tpm_version(1), tpm_takeownership(8), tpm_setclearable(8),
       tpm_setactive(8), tpm_setenable(8), tcsd(8)


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