The Trusted Data Format (TDF) is an open source data protection standard invented by Virtru Co-Founder, Will Ackerly. The TDF is essentially a protective wrapper containing your content. Whether you’re sending an email message, an Excel spreadsheet, or a cat photo, your emails and files are encrypted and “wrapped” in the TDF. When a recipient attempts to open these message and/or files, the TDF wrapper verifies whether that user is eligible to access the data. Once verified, they can decrypt, open, and read the secure content.
For secure files, users may notice that the filename extension has ".tdf" on the end. This lets users know that the file has been encrypted.
If a secure file has had Persistent File Protection (PFP) applied to it, then its filename extension will include ".tdf.html". These files will remain secure when downloaded or shared, requiring that users verify their identity in the Secure Reader before accessing the content.