At work
The screen in the conference room is a monitor. It is also a sensor.
Content recognition does not stop when you stop using the television's own apps. It runs on the HDMI input too. In an office that means the thing being sampled is whatever your staff put on the screen.
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connections to the ad-recognition servers
A television used as nothing but a monitor still reported home.
In September 2026 Gamers Nexus mirrored the traffic from an LG G3 that was doing one job: showing the picture from a laptop over HDMI. No streaming apps, no built-in channels. Across the session it reached 29 different endpoints 107 times, 44 of those to the Alphonso content-recognition service, and sent about 4 MB. A second set tested the same way did the same thing.
The same investigation notes plainly that content recognition "can also run when the TV is used as a monitor", and a researcher examining the logs found "even an HDMI connection was undergoing ACR".
The monitor-only test, at 29:36. On monitor use, at 13:31. Every figure on this page, with its source.
“What happens when I'm taking a patient phone call, or I'm doing patient video visits, and there's an LG monitor in the background? How is that patient information protected?”
What is actually on those screens
A consumer television does not know the difference between a film and a patient list. It samples what is displayed and reports the result.
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Exam rooms and nurse stations
Patient names, dates of birth, images, charts and schedules, shown on a screen that samples what it displays and sends the result to an advertising company.
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Conference rooms
Whatever anyone mirrors from a laptop. Unreleased numbers, deal documents, roadmaps, candidate lists, a shared screen in a video call.
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Law offices and case rooms
Privileged material on a display whose maker has an agreement with you that says it may share what it collects for advertising.
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Classrooms and school offices
Student records and grades on a screen governed by a consumer terms document that a teacher accepted on a remote.
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Waiting rooms and lobbies
A signage screen is usually the safest of these, until someone plugs a laptop into it for five minutes.
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Break rooms and back offices
The set nobody thinks about, on the same network as everything else, running a scan of the devices it can see.
These televisions also scan the network they are on. In the same investigation one set enumerated at least 38 other devices, including staff phones and watches. The scan itself is confirmed; whether the full inventory is uploaded was inferred from encrypted traffic, so treat it as an open question rather than a finding.
Questions your compliance review should be able to answer
We are not going to tell you whether this breaches a particular rule, because that depends on your organisation, your agreements and your facts. What we can say is that these are the questions a reviewer will ask once they know what the screen does.
- Is every television in the building on the asset inventory, with the same treatment as any other networked endpoint?
- Does the risk analysis account for a display that samples screen content and transmits it to a third party?
- Is there a business associate agreement, or any contract, with the advertising company receiving that data? For consumer televisions the answer is almost always no.
- Which screens are on the same network segment as systems holding regulated or confidential records?
- Who accepted the terms on each set, and did they have authority to agree to data sharing on behalf of the organisation?
- If a setting is switched off, who verifies it is still off after a firmware update?
Three steps, in order
The first two are free and you can start this afternoon.
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01
Inventory the screens
Walk the building with the free app on a phone. It lists every television and streaming device on the Wi-Fi, names the platform, and says whether that platform fingerprints the screen. Nothing leaves the phone, so it does not add a vendor to your review.
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02
Disconnect anything that is only a display
Most screens in an office show a laptop, a signage player or a video bar. They do not need an internet connection at all. Factory reset, skip the network step, and drive the screen over HDMI. There is then nothing to sample, nothing to send, and no setting to re-verify. This costs nothing.
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03
Put the rest behind hardware
Some rooms genuinely need a networked screen. Those go behind a device that blocks the fingerprinting and ad endpoints, logs every attempt, and reports monthly, so the control is demonstrable rather than a menu someone remembers toggling.
Screens in more than one room?
We are working with a small number of clinics, firms and offices on walkthroughs: what is on the network, what each screen is doing, and which ones can simply be taken off the network for nothing.
Tell us roughly how many screens and what kind of site, and we will come back to you. Write to hello@glassback.app or join the list below.
This page describes how these devices behave and cites the tests it relies on. It is not legal advice and it is not a compliance assessment. Whether a particular television creates a reportable risk in your organisation is a question for your own counsel and compliance officer, working from your agreements and your environment. Every claim, with its source. How we source verdicts.