What is mean by Open status and the password policy is enabled

Summary:

Am referring the PD user guide. We use every stage of approval of workflow before its released status to prompt the signature policy - what is mean by Open status of the CO is it until released?

Questions in the statement from user guide

 If the change order is in Open status and the password policy is enabled, the user receives the authentication prompt when the change order is in Approval status.

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None, this is required as part of CFR part 11 compliance ,