Encrypted Data
After downloading driver-card data, the TachoAI (and TachoAI) app automatically emails you the infringement report and the card data. From June 2026 you can choose whether the files arrive encrypted (password-protected) or plain — the setting can be changed at any time from the app menu.
Enable or disable email encryption
You can now choose whether TachoAI (or TachoAI) sends the card-download files by email as encrypted (password-protected) or as plain attachments. The setting can be changed at any time from the app menu in either app.
How to change it:
- Open the TachoAI or TachoAI app
- Open the menu (TachoAI: top-right dropdown · TachoAI: bottom tab)
- Select "Email encryption" (next to "Access code")
- Choose Without encryption or Encrypted, then confirm
For new users
new accounts default to Without encryption. Enable encryption from the menu if you want it.
What do you receive by email?
After a successful card download and upload, you receive the following files by email:
| File | Content | Encryption |
|---|---|---|
| report_...pdf | Infringement report — detailed analysis of driving and rest times | Password-protected PDF |
| C_2026...zip | Digital data file from the driver card (.ddd file) | Password-protected ZIP |
The following sections apply only when encryption is on. If you receive files without encryption, no password is needed — open the .pdf in any reader, and use the .ddd file directly without extracting.
What is the password?
The encryption password is the last 6 characters of the driving licence number stored on the driver card.
Example
If the driving licence number is CZ123456, the password is: 123456
View access code in the app
If you don't remember the password, you can check it anytime in the app:
- Open the TachoAI app
- Tap the menu icon (☰) in the bottom right corner
- Select "Access Code"
- The 6-character code is displayed — use this to open your files
Opening the PDF file
The encrypted PDF file can be opened with any PDF reader (Adobe Reader, browser, etc.). When opening, it will ask for a password — enter the 6-character code described above.
- Open the received report_...pdf file
- In the dialog box, enter the password (last 6 characters of the licence number)
- Click "Submit" or "OK"
- The report will be displayed
Extracting the ZIP file
Important: Windows 11 limitation
The built-in Windows 11 File Explorer does not support extracting password-protected ZIP files. It will show the contents but extraction will fail. You need a third-party program!
Recommended free programs for extracting encrypted ZIP files:
Steps to extract (using 7-Zip as an example):
- Install 7-Zip
- Right-click on the .zip file → 7-Zip → "Extract Here..."
- Enter the password (last 6 characters of the driving licence number)
- The .ddd file will be extracted