If you are a recipient of a Virtru secure email, the secure email may include an attachment where Persistent Protection (PFP) has been applied. If this is the case, you will see a grey attachment chip icon, with a lock symbol, and the extension tdf.html (non-PFP file attachments will have various colors other than grey).
The Persistent Protection security option applied by the sender allows them to maintain full control and visibility into who can access the document. This type of file is protected no matter where it goes - restricting access only to authorized parties - even when downloaded.
This means that if an original recipient downloads and shares the file outside of Virtru with a new user, the new user will have to request access.
If a tdf.html file is downloaded and sent securely in a new email to a new user, the new user will know that the file was re-shared if it is "greyed out" and has an orange triangle with an exclamation mark.
Requesting Access to a Protected file from the Secure Reader
If you are the recipient of a tdf.html file and you attempt to open a file to which you do not have access (from the original secure file creator or author), you will be presented with a screen in the Virtru Secure Reader that allows you to request access. Once you click the Request Access button, an email will be sent to the owner of the file with your request.
Access Granted or Denied Verification Emails
Once your request is granted or denied, you will be informed via an email from Virtru. If your request is granted, return to the email or file you received before to retry access to the tdf.html file. After verification, you should have access to the document. The Persistent File Protection support article contains more information about accessing and viewing tdf.html files.
If access is denied, you will receive notification informing you, and you will not be able to access the secure file.