PrismDesk Privacy Policy
Effective 14 October 2026 / 発効日 2026 年 10 月 14 日
Who we are
PrismDesk is developed and published by Masato Okumura (奥村 真智), a sole proprietor trading as "async0x4c", based in Tokyo, Japan ("we", "us"). Contact: [email protected].
For the purposes of the EU/UK GDPR and the Japanese Act on the Protection of Personal Information (APPI), we are the controller for the limited data described in sections 2 and 3.
1. The PrismDesk apps do not collect your data
The PrismDesk Windows host application, the PrismDesk virtual display driver, the PrismDesk virtual camera and the PrismDesk Android client contain no analytics, advertising or tracking SDKs, and send us no usage data of any kind.
- All screen, audio, camera and input data travels directly between your own devices over your local network. It never passes through our servers. We have no servers that receive your content.
- The apps contain no analytics, advertising or tracking SDKs.
- There is no automatic update check. PrismDesk never looks for a new version on its own — not at start-up, not in the background, and not while you are using it. The Windows app has a Check for updates button; it is the only thing that looks, and only while you are pressing it. See section 1.2.
- The free edition does not connect to the internet at all unless you press one of those buttons. If you never enter a licence key and never press Check for updates, the apps only ever talk to your own devices on your own network.
- Activating PrismDesk Pro contacts our payment provider, Polar. See section 1.1.
- Diagnostic logs and the "Export diagnostics" file are written only to your
own computer (
%LOCALAPPDATA%\PrismDesk). They reach us only if you choose to attach one to a support email. They contain technical information about your session — device names, display resolutions, IP addresses on your local network, timings and error codes, and details of your graphics hardware (the names of your graphics cards, their driver versions, and the codes and identifiers their drivers return when something fails) — please review the file before sending it. They never contain anything from what is on your screen, and your licence key is never written to them.
1.1 Activating PrismDesk Pro
PrismDesk Pro licence keys are issued and checked by Polar Software, Inc.
(polar.sh), the merchant of record for all PrismDesk purchases. Checking a
key means contacting Polar. Together with Check for updates (section 1.2),
these are the only situations in which a PrismDesk app connects to anything
outside your own network.
It happens only when you press a button. There is no background check, no check at start-up, and no check while you are using PrismDesk. Specifically, we contact Polar only when you press Activate, Check licence or Deactivate this PC in the Windows app.
| What is sent to Polar | Why |
|---|---|
| The licence key you typed in | To confirm it is genuine and still valid |
| Our organisation identifier | Polar requires it to look the key up |
| A name for this PC, shown to you in the app before it is sent (by default your Windows host name) | So that you can tell your activations apart, and release the one you no longer need |
| Your IP address (unavoidable for any internet connection) | Polar receives this as part of the request |
Nothing else is sent. No screen contents, no device list, no usage data, no diagnostics.
Polar's handling of this data is governed by Polar's own privacy policy
(https://polar.sh/legal/privacy). Polar is an independent controller for it.
After a successful activation, PrismDesk needs no internet connection. The result
is stored on your own computer, encrypted with Windows DPAPI so that only your
Windows user account on that machine can read it, at
%LOCALAPPDATA%\PrismDesk\license.json. PrismDesk does not contact Polar again
unless you press one of the three buttons above. If Polar is unreachable,
PrismDesk Pro keeps working.
To remove your licence from a computer, press Deactivate this PC. This tells Polar to release the activation slot and deletes the local file.
1.2 Checking for a new version
The Windows app has a Check for updates button in its Settings tab. Pressing
it fetches one small file from our website (prismdesk.app) that says which
version is the latest, and compares it with the version you are running.
It happens only when you press that button. There is no check at start-up, no check in the background, and no check while you are streaming. Nothing is downloaded or installed: if a newer version exists, PrismDesk tells you and offers to open the download page in your browser.
| What is sent | Why |
|---|---|
| The request for that one file, and nothing else | To read which version is the latest |
| Your IP address (unavoidable for any internet connection) | Our website host receives this as part of the request |
We do not send your version, your Windows version, your hardware, or anything that identifies you or your PC. The request carries no identifier of any kind, so we cannot tell one press from another.
Our website is served by Cloudflare, Inc., who processes the request logs (including IP addresses) on our behalf as our processor, as described in section 4.
Android permissions
| Permission | Why the app asks for it |
|---|---|
| Camera | To read the connection QR code shown by the Windows host, and — only if you turn the feature on — to send your device's camera to the PC as a virtual webcam. |
| Internet, network state, Wi-Fi state, multicast, nearby Wi-Fi devices | To find your PC on the local network and to exchange video, audio and input with it. |
| Notifications, foreground service, wake lock | To keep the session running and show its status while the app is in the background. |
The app does not request location, contacts, storage or microphone permissions, and does not use any permission to determine your location.
The QR code is decoded on your device with Google's ML Kit barcode-scanning library in its bundled, on-device form. Your camera images never leave your device: Google's terms state that "processing of the input data (e.g. images, video, text) fully happens on-device, and ML Kit does not send that data and the resultant outputs to Google servers."
ML Kit does, however, send usage metrics to Google. This happens whenever the scanner runs, it is part of the library, and we cannot switch it off. According to Google, these metrics are limited to:
- device manufacturer, model, OS version and build, and available ML hardware;
- our app's package name and version;
- a per-installation identifier that, in Google's words, is "not intended to uniquely identify a user or physical device";
- latency measurements, the image format and resolution passed to the scanner, and the size of its input and output;
- the ML Kit version, the type of event (initialisation, detection, release) and any error code.
Google states that it uses this data "to measure performance, debug, maintain and improve the APIs, and detect misuse or abuse", that it encrypts the data in transit over HTTPS, and that it does not transfer it to third parties. We never see it. We do not enable ML Kit's auto-zoom feature, so the additional scan-session data Google associates with that feature is not collected either.
ML Kit is governed by Google's terms (https://developers.google.com/ml-kit/terms, last updated 14 May 2025) and its data disclosure (https://developers.google.com/ml-kit/android-data-disclosure).
2. Purchases are processed by our merchant of record
PrismDesk Pro licences are sold by Polar Software, Inc. ("Polar"), who is the seller and merchant of record and an independent controller of the personal data you provide at checkout (name, email address, billing country, payment details). Polar's privacy policy: https://polar.sh/legal/privacy
Polar shares with us your name, email address, country, order ID and licence key, so that we can deliver the licence and provide support. Legal basis: performance of a contract and our legitimate interest in supporting our customers.
We keep this information for as long as your licence is valid, and afterwards for 7 years as required by Japanese tax and bookkeeping law.
3. Support and the optional newsletter
- Support. If you email [email protected] we process your email address, your name and the content of your message, including any diagnostic files you attach, in order to answer you. Legal basis: performance of a contract, or our legitimate interest in providing support. Retention: 2 years after the last message in the thread.
- Newsletter (optional). If you subscribe on our website we store your email address to send occasional product announcements. Legal basis: your consent, which you may withdraw at any time using the unsubscribe link in every message. Processor: Kit Inc. (an Idaho corporation, United States; formerly ConvertKit), whose privacy policy is at https://kit.com/privacy. Retention: until you unsubscribe.
We do not sell your personal data, and we do not use it for advertising.
4. Our website
Our website is hosted on Cloudflare Pages. Cloudflare processes connection data, including IP addresses, as our processor in order to deliver the site and protect it from abuse.
We use Cloudflare Web Analytics, which uses no cookies, no client-side storage and no fingerprinting, and does not collect personal data. We therefore do not display a cookie banner. Cloudflare serves this site, and Cloudflare Web Analytics is enabled for it.
5. International transfers
We are based in Japan. If you are in the EEA or the UK, the personal data described in sections 2 and 3 is transferred to Japan. Japan has an adequacy decision from the European Commission and from the UK, so no additional safeguard is required for that transfer. Our processors (Polar, Cloudflare and our email provider) apply their own transfer mechanisms, described in their privacy policies.
6. Your rights
Depending on where you live, you may have the right to access, correct, delete, port or restrict the processing of your personal data, to object to processing, and to withdraw consent. Email [email protected]; we answer within 30 days.
You may also complain to your data-protection authority: your national authority in the EEA, the Information Commissioner's Office in the UK (https://ico.org.uk/), or the Personal Information Protection Commission in Japan (https://www.ppc.go.jp/).
個人情報保護法に基づく公表事項
| 項目 | 内容 |
|---|---|
| 個人情報取扱事業者 | 奥村 真智(屋号 async0x4c・個人事業主) |
| 所在地 | 東京都(詳細は請求があれば遅滞なく電子メールにて開示します) |
| 利用目的 | ライセンスの発行・管理、サポート対応、(同意を得た場合)製品情報の配信、法令上の帳簿保存 |
| 第三者提供 | 法令に基づく場合を除き行いません。決済事業者(Polar Software, Inc.)は独立した事業者として決済情報を取り扱います |
| 外国にある第三者への提供 | Polar Software, Inc.(米国)/ Cloudflare, Inc.(米国)/ Kit Inc.(米国アイダホ州)。いずれも各社のプライバシーポリシーに従って取り扱われます |
| 安全管理措置 | 二要素認証を有効にしたアカウントでのみ保管し、業務上必要な範囲でのみ利用します |
| 開示・訂正・利用停止等の請求窓口および苦情の申出先 | [email protected] |
7. Children
PrismDesk is not directed at children under 13, and we do not knowingly collect personal data from them. If you believe a child has sent us personal data, email [email protected] and we will delete it.
8. Changes to this policy
We will post any change on this page and update the date at the top. If a change is material we will also announce it on our website.