Dấu Việt Privacy Policy
In one sentence: Dấu Việt collects no personal data, stores no personal data, and transmits no data whatsoever. The rest of this page spells out each aspect.
Effective 10 November 2026 · Applies to Dấu Việt version 0.9.0 and to the www.dauviet.com website
What we do NOT collect
- Anything you type, in any form
- Keystroke logs or input history
- Names, e-mail addresses, phone numbers or any identifiers
- IP addresses, device identifiers or location data
- Usage data, telemetry or automatic crash reports
- Clipboard contents (unless you deliberately run a command that needs them)
- A list of your installed programs, or any data outside the input method's job
Why we can state that plainly
Dấu Việt contains no network code at all: no sockets, no HTTP, no WinINet, no cloud service, no silent updater. The software has no route to send data anywhere, even if we wanted one.
Its internal logger has no function that accepts user text — it can only record a fixed message plus a number, and it is switched off by default.
1. Data the application stores on your computer
Everything stays on your machine, never leaves it, and you can delete it at any time.
| File | Contents | Written by |
|---|---|---|
settings.json | Options, hotkeys, per-application rules | The app, from your settings |
dictionary.json | Words you added to your personal dictionary | You |
snippets.json | The snippets you created | You |
profiles.json | Configuration profiles | The app |
diagnostics.log | Technical log (hook installed/removed, file read errors…). Off by default and never contains what you typed | Only if you enable it |
Location: %LOCALAPPDATA%\DauViet\, or a data folder next
to the executable in portable mode. They are plain JSON files you can open in
Notepad. Deleting that folder removes everything Dấu Việt has ever stored.
2. How keystrokes are handled
To turn your keystrokes into Vietnamese, Dấu Việt has to see the keys you press — that is the technical nature of every input method. Concretely: it installs a Windows low level keyboard hook, converts the keys into letters, and sends the result back into the application you are typing in.
- The word in progress exists only in memory and is cleared at every word boundary.
- No copy is written to disk, sent over a network, or kept after the app exits.
- Win32 password fields that Windows exposes as such are skipped entirely.
- Windows belonging to a higher-integrity process, and any application on your exclusion list, are skipped.
- You can suspend all key processing at any time from the notification area menu.
3. Clipboard
Dấu Việt does not watch the clipboard. It only touches the
clipboard when you explicitly run a text command (for example “UPPERCASE” on the
current selection): it saves whatever the clipboard holds, borrows it to replace
the text, then restores the previous content. The {clipboard} variable
in snippets is disabled by default and must be switched on by you.
4. The www.dauviet.com website
This website is static HTML. No cookies, no JavaScript, no analytics (Google Analytics or otherwise), no tracking pixels, no advertising, no third-party embeds. Our hosting provider may keep ordinary server logs (IP address, time of request) as a technical default; we do not use those logs to identify visitors.
The site links out to VirusTotal so you can verify the download. Following that link takes you off our site and under that service's own privacy policy.
Download counting
The download button goes through a counter script so we know how many times the
software has been downloaded. Each download records: the file name, the date and
time, the referring domain, the page language (vi/en) and the operating system
inferred from the User-Agent string.
Your IP address is not stored. To count “how many different people
in one day”, the script stores a hash of
sha256(secret + date + IP + User-Agent) truncated to 16 characters —
it cannot be reversed into an IP address, and because the date is part of the
input it cannot link your activity across two days either. There are no cookies, no
tracking pixels and no user profiles. This data lives in a single SQLite file on
our server and is shared with no one.
5. Your rights and the legal questions
There is no data to request
Because we collect no personal data, there is no record for you to access, correct, export or erase. The only data that exists sits on your own computer, entirely under your control.
Children
The application collects no data from anyone of any age, so it collects no data from children either.
Sharing with third parties
There is nothing to share, so we do not sell, rent or transfer user data to anyone.
If you install from an app store
When you obtain Dấu Việt through a distribution platform (for example the Microsoft Store), that platform may collect download or installation data under its own policy. That is outside our control and unrelated to the data handling inside the application.
6. Changes and contact
If this policy changes we will update this page and the effective date at the top. Any substantive change — for instance if a future version gained a feature that needs network access — will be stated plainly, together with a way to decline it.
Questions about this policy: [email protected]. Official website: www.dauviet.com.
Every claim above is verifiable: the released file's SHA-256 hash is published on the security page and has been scanned on VirusTotal. The program runs without administrator rights, installs no service and no driver, and is removed by deleting one file and one settings folder.