Does your Smart TV know what you’re watching? ACR, ads, and TV privacy.

Does your Smart TV know what you’re watching? ACR, ads, and TV privacy.

In the past, a television was a very simple device: it received a signal and displayed an image.

Today, a Smart TV is simultaneously an internet-connected computer, an app platform, an advertising device, and part of a home digital ecosystem.

It can track which apps we launch, how long we use them, and which account we are logged into—and, in some cases, even what is currently being displayed on the screen.

And this is where the most interesting part of the story begins.

Your TV can recognize exactly what you are watching.

This technology is called ACR—Automatic Content Recognition.

Simply put, it can be compared to Shazam for television.

The system captures a sample or creates a digital "fingerprint" of the image or audio and compares it against a database of known content.

This allows it to identify specific items on the screen, such as:
a movie,
a TV series,
a TV program,
a sports match,
a commercial,
a game,
or a TV channel.

Depending on the specific ACR solution, the technology can work with more than just apps installed directly on the TV.

A study conducted by researchers from University College London and other institutions on Samsung and LG TVs revealed that the ACR mechanism can also function when the TV is used merely as a display for content delivered via HDMI. This means the source could be, for example, a game console, a computer, or an external media player.

The researchers also confirmed that disabling the relevant privacy settings stopped the observed data traffic to ACR servers. This is an important distinction: ACR does not need to know which application the content comes from; it recognizes what appears on the screen.

Why do manufacturers want to know what you are watching?

Information about how the TV is used is valuable.

It allows them to determine, among other things:
- which types of programs are popular,
- how long users watch specific content,
- which advertisements were displayed,
- which devices and content sources are being used,
- what viewing trends look like.

The modern TV market is thus linked to the digital advertising market.

A study published in 2025 in the journal *Convergence* describes how Smart TV manufacturers—including Samsung, LG, and Vizio—integrated ACR technologies into their advertising platforms and viewership measurement systems.

A TV, therefore, does not have to generate revenue solely at the moment of purchase.

An internet-connected screen can become part of a larger advertising ecosystem.

What data can a Smart TV collect?

ACR is just one component.

The TV’s operating system can also process technical information and data regarding device usage.

For instance, Google states that Google TV may process, among other things:
viewing activity,
information about streaming services used,
approximate location,
device and user identifiers,
information about installed applications,
interactions with the device,
diagnostic data and crash information. Amazon, however, states that Fire TV may collect data regarding device usage, home screen navigation, settings, and the launching and closing of applications.

That is not all.

Apps constitute a separate source of information.

For instance, Netflix may store viewing history, information on interactions with content, details about the devices used to access the account, payment data, and profile preferences.

Thus, there are at least three distinct layers of data collection:
the TV’s operating system,
mechanisms such as ACR,
apps and services running on the TV.
These should not be conflated.

Does the TV take screenshots?

It depends on the technology.

ACR does not typically involve transmitting the full video being watched by the user to the manufacturer.

The systems generate distinctive signatures—or fingerprints—of the image or audio and compare them against a reference database.

Samsung explains that its ACR generates unique signatures to identify viewing information. At the same time, the company emphasizes that it does not record or "watch" the content displayed on the screen in the way a human would.

What matters more for privacy is the outcome of this process: the system can determine what was watched and for how long.

Is ACR enabled automatically?

It can no longer be said that ACR is always, or even by default, active on every new Smart TV.

How it operates depends on the manufacturer, the model, the country, and the terms accepted during setup.

In its documentation, Samsung states that ACR operates once the user consents to the "Viewing Information Services."

LG, on the other hand, states that its ACR feature is disabled by default and requires acceptance of the "Viewing Information Agreement." Roku also notes that ACR is not enabled by default and requires the relevant feature to be turned on.

However, the issue lies elsewhere.

When setting up the TV for the first time, users often have to navigate through numerous screens covering configuration, agreements, consents, and settings.

It is easy to accept a feature without fully understanding the implications.

That is why it is worth revisiting the privacy settings after the initial setup and reviewing them again.

Is your Smart TV eavesdropping on you?

That is a separate issue and should not be conflated with ACR.

Voice-controlled TVs may feature a microphone built into the set itself or the remote control.

However, this does not automatically mean that every conversation in the room is constantly being recorded and sent to the manufacturer.

For instance, LG stated in 2016 that on supported models, detection of the wake word takes place locally on the device. The actual speech recognition process only begins once voice interaction is activated.

Some models also include a physical switch to disable the TV's built-in microphone.

In the case of the remote control, the microphone may only activate when the appropriate button is pressed.

The conclusion is simple:

the microphone, the voice assistant, and ACR are three distinct things.

ACR is used for content recognition.

The microphone handles voice commands.

The advertising system may utilize entirely different identifiers and data.

Lumping them all together into a single "the TV records everything" mechanism is inaccurate.

And what about ads?

In this regard, Smart TVs are increasingly resembling smartphones.

Google TV has its own device advertising ID. Users can reset or delete it. However, deleting the ID does not make ads disappear; it simply limits one method of personalizing them.

Samsung also outlines the possibility—subject to obtaining the necessary consents—of combining viewing information with device identifiers and third-party audience data. LG separates consent for ACR from consent for Interest-Based Cross-Device Advertising.

This is important.

ACR itself does not automatically mean that every piece of information regarding the content being watched is used for behavioral advertising.

It depends on the system, the consents granted, and the manufacturer's services.

Has this ever been a regulatory issue?

Yes.

One of the most significant examples is the Vizio case in the United States.

In 2017, the Federal Trade Commission announced a settlement regarding the collection of viewing data from approximately 11 million Vizio televisions without the users' knowledge or consent.

According to the FTC, the system was capable of collecting information on content displayed from cable TV, over-the-air broadcasts, streaming services, DVD players, and other devices.

This viewing data could then be linked to demographic information and used for purposes such as targeted advertising.

Although this case dates back some time, it remains a clear illustration of why settings related to ACR (Automatic Content Recognition) and viewing data matter.

What about GDPR?

In the European Union, an internet-connected device does not fall outside the scope of data protection regulations simply because it is a television.

If information can be linked to a specific individual or household, personal data regulations may apply.

If processing is based on consent, then—in accordance with GDPR principles—that consent must be, among other things, freely given, specific, informed, and unambiguous.

The European Data Protection Board also points out that Article 5(3) of the ePrivacy Directive covers a wide range of technologies that allow access to information stored on a user's terminal device—not just traditional cookies.

Therefore, the key question is shifting from simply:

"Does the TV collect data?"

to:

what data is collected, for what purpose, on what legal basis, and to whom is it transmitted?

How can you limit Smart TV tracking?

The first step is to review all of your TV's privacy settings. Look for names such as:

Automatic Content Recognition, ACR, Viewing Information Services, Viewing Information Agreement, Viewing Data, Smart TV Experience, Enhanced Viewing, Interactive TV, Samba Interactive TV, Interest-Based Advertising, or Personalized Advertising.

The specific names depend on the manufacturer and model.

Disable features related to content recognition if you do not need them.

Next, check the settings for ad personalization and the advertising ID.

On Google TV, you can access privacy and ad settings to delete the device's advertising ID.

Fire TV offers separate settings for device usage data, app data, and interest-based advertising.

If you do not use voice control, you can also disable the relevant feature or—if the TV allows it—physically turn off the microphone.

You should also treat a Smart TV like a computer.

The TV runs on an operating system, launches applications, and communicates with the Internet.

Therefore, it should be kept up to date.

The UK’s National Cyber ​​Security Centre notes that promptly installing updates is a fundamental way to protect Internet-connected devices, as updates patch discovered vulnerabilities.

If the manufacturer has stopped releasing updates for a very old TV, it is worth considering restricting its direct Internet access and using an external, up-to-date streaming device instead.

This does not guarantee complete anonymity.

It simply changes the platform handling the applications and the connection to online services.

Is it worth isolating the Smart TV on a separate network?

If your router allows you to create a separate network for IoT devices or a properly isolated guest network, this serves as a sensible additional security measure.

The TV generally does not need access to computers storing business documents, a NAS server, or other sensitive devices in the home.

Network segmentation will not stop the TV manufacturer or Netflix from collecting data.

However, it can limit the impact of a potential device compromise and restrict the TV's access to the rest of the home network.

The most radical solution is very simple.

If you do not actually need the Smart TV features, the television can simply serve as a display screen.

You can disconnect it from the Internet and connect an external streaming device, console, or computer.

Independent tests by RTINGS from 2026 indicate that this is one way to limit the amount of information directly accessible to the TV manufacturer.

Of course, this does not mean an end to tracking.

Apple TV, Google TV, Fire TV, Roku, and streaming apps have their own privacy policies and data collection mechanisms. So, the entity to which we entrust our information is changing.

Does the TV really watch us?

Not in the sense that every Smart TV has a camera analyzing the person sitting on the couch.

But a modern TV can know far more than its CRT predecessor.

It can know which apps you launch.

It can track your service usage history.

It can hold an advertising ID.

It can process technical data and your IP address.

And if you enable ACR, it can also recognize some of the content appearing on the screen, even if it comes from an external device.

That is why the question:

“What does your TV do when you watch a movie?”

has a slightly different answer in 2026 than it did just a few years ago.

It displays the movie.

But depending on the model, configuration, and the consents you have granted, it may simultaneously generate information about how you use it.

You do not have to simply accept this.

It is worth knowing where the relevant switches are located.

October 3, 2026