When you create or edit an archiving policy you can choose what to do with the files that have explicit permissions set on them:
Note the following when deciding whether to archive these files:
When Enterprise Vault archives a file, it gives the archived file the same permissions as the folder that contained the original file. Enterprise Vault gives the shortcut the same permissions as the original file.
Someone with access to the original folder can find and access the archived version of the file, even if the original file's permissions denied access. The same person cannot use a shortcut to access the file.
From Enterprise Vault 8.0 SP1 onwards, a new installation of Enterprise Vault provides the following defaults for this setting:
On upgrade, Enterprise Vault retains the current setting in the existing archiving policies.