IAB Europe this month published its Guide to Programmatic for CTV, a detailed cross-sector document developed jointly by the organisation's CTV Working Group and Programmatic Working Group. The guide addresses ecosystem fundamentals, technical standards, data and targeting frameworks, ad format definitions, media quality, and measurement - all within the European regulatory context. It is the most comprehensive treatment of programmatic connected television the body has produced.

The publication arrives at a moment of sharp growth in streaming consumption across the continent. According to the guide, subscription-based video-on-demand (SVOD) consumption in Europe grew by more than 200% in 2024, while broadcaster video-on-demand (BVOD) rose nearly 30%. Those figures, drawn from the working group's own analysis, underline why the industry has accelerated its push for standardised trading infrastructure. European digital advertising reached €118.9 billion in 2024, with SVOD recording growth of 222.4% as Netflix, Disney+, and Amazon Prime Video extended their advertising capabilities across European markets.

Despite that expansion, the guide is candid about what is missing. Definitions remain fragmented. Terminology is inconsistent. Interpretations of what "CTV" and "digital video" actually mean differ across buyers, sellers, and technology providers. The document is partly a corrective effort - an attempt to establish shared language before those inconsistencies compound further.

IAB Europe's Guide to Programmatic for CTV
IAB Europe's Guide to Programmatic for CTV.pdf
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The ecosystem and its components

The guide positions programmatic CTV as a data-driven system that automates the buying and selling of video advertising across streaming platforms. According to the guide, it enables advertisers to reach targeted audiences across a fragmented mix of smart TVs, streaming apps, and over-the-top (OTT) devices. The supply chain involves demand-side platforms(DSPs), through which advertisers and agencies purchase inventory programmatically targeting audiences by viewing habits, location, and device type; supply-side platforms (SSPs), through which publishers and content providers connect to a global pool of advertisers; third-party data providers and measurement tools that enable audience segmentation and attribution; and ad serving and verification technologies that confirm viewability and brand safety.

This ecosystem infrastructure is not new, but its application to the television screen introduces complexities that the guide addresses in technical depth. A notable framing in the document is that CTV is not simply online video at larger scale - it is a distinct environment with distinct rules.

SSAI: transparency requirements in a server-side world

One of the more technical sections of the guide concerns Server-Side Ad Insertion (SSAI), a method widely used by CTV publishers to deliver advertising within video streams by stitching ads directly into content before delivery. According to the guide, SSAI ensures seamless playback and a broadcast-quality user experience, but it introduces measurement complexity because the ad insertion and delivery logic moves from the client device to a server-side environment.

The guide states that publishers and technology providers must clearly disclose when SSAI is being used, and whether impressions are measured server-side, client-side, or through a hybrid approach. This is necessary to maintain alignment with Media Rating Council (MRC) and IAB Tech Lab standards. Beyond disclosure, the guide specifies that SSAI implementations must preserve the integrity and transparency of underlying device and application signals, so buyers and measurement providers can validate the environment and detect invalid traffic.

The document goes further on supply chain integrity. CTV publishers are expected to implement app-ads.txt, maintain accurate sellers.json files, and support SupplyChain Object disclosures. European publishers showed 73% adoption of supply chain transparency standards as of August 2025, with 99.83% validity rates among those that had implemented the standards - but gaps remain, particularly in CTV-specific app store coverage. An additional layer the guide recommends is the use of ads.cert authenticated connections to mitigate fraud risk created by limited signal transparency in SSAI environments.

Live events: latency, concurrency, and taxonomy

Live events occupy a dedicated section of the guide because they introduce distinct technical challenges that on-demand environments do not face. Sports, news, and tentpole cultural moments deliver highly engaged, concurrent audiences at scale. According to Index Exchange analysis cited in the guide, live audiences are highly attentive, reinforcing the premium nature of live event inventory compared to on-demand CTV.

The technical problem is real-time ad decisioning under time pressure. Programmatic systems must make decisions within tight time constraints while maintaining stream stability. Ad opportunities must be identified and filled without introducing buffering or playback delays. Without standardised metadata - event type, league, match status, live indicators - campaigns risk pacing issues, misaligned targeting, or inconsistent delivery during high-demand moments.

The guide points to LEAP's broader standards for live event taxonomy, signalling, and technical alignment as the framework that addresses these requirements. When signals are consistently defined and passed through standardised APIs, buyers can value live impressions correctly and publishers can ensure their inventory is not misclassified or undervalued. Google Ad Manager introduced live-biddable CTV capabilities in November 2025 to address exactly this problem, enabling publishers to monetise unpredictable live events through real-time programmatic transactions.

HbbTV and European market specificity

A section on local considerations addresses Hybrid Broadcast Broadband TV (HbbTV), an international standard that merges broadcast and broadband delivery, allowing viewers to access free-to-air TV and internet-delivered services through a single interface. According to the guide, HbbTV is integrated into most European TV sets and enables interactive features and targeted advertising within the broadcast environment.

Its relevance to programmatic buyers is practical: HbbTV environments often limit access to persistent identifiers such as cookies or mobile ad IDs. Cross-device targeting and frequency capping therefore become challenging, and household-level or contextual targeting is more effective in practice. Adoption also varies by region, with particularly strong penetration across Europe and parts of Asia, making it a non-uniform surface for campaign planning.

Ad creative compliance: ACIF and national clearance bodies

The guide also covers ad compliance as a structural consideration. In the UK, Clearcast acts as a central ad copy clearance body to ensure that TV and VOD ads comply with broadcast advertising codes. The IAB Tech Lab released the Ad Creative ID Framework (ACIF) v1.0 to address this - defining a persistent identifier for ad creative at every phase in the video advertising supply chain. Some APIs have been developed for integration with Clearcast in the UK and ARPP in France. IAB Tech Lab's 2025 technical standards roadmap identified ACIF for cross-television measurement as a long-term development priority alongside device attestation integration into the Open Measurement SDK.

Data and targeting: the household-level reality

The guide's section on data and targeting is among its more substantive contributions. According to the document, CTV operates within a distinct data environment shaped by household-based viewing, screen-centric behaviour, and a limited availability of persistent, user-level identifiers. In Europe, that environment is further defined by robust privacy regulation. Effective CTV targeting therefore depends less on individual identity and more on high-quality signals derived from viewing behaviour, content context, and device-level interactions.

The guide draws a clear distinction between two categories of CTV data. Modelled data uses statistical techniques, panels, or proxy indicators to infer likely household interests or behaviours - an approach that can support scale but is inherently probabilistic. Deterministic data, by contrast, is based on observed events such as confirmed content viewing or ad exposure on the television screen. In regulated markets, the guide notes, deterministic signals are often easier to explain, audit, and align with clearly defined purposes.

Automatic Content Recognition (ACR) data receives dedicated attention. ACR identifies content being displayed on a television screen by matching on-screen pixels or audio signatures to known programming. This generates exposure-based insights tied to specific content and moments in time. Crucially, ACR derives signals from on-screen content rather than cookie-based or login-based identifiers, making it a compliant mechanism when deployed with appropriate consent and transparency. Before activation, raw CTV signals are typically enriched with additional metadata - content attributes, genre classifications, device context, and viewing recency and frequency - transforming them into scalable, privacy-safe audiences suitable for programmatic activation.

On consent, the guide reports concrete numbers. As of publication, 18 consent management platforms (CMPs) are validated for CTV, while 466 vendors registered to the Transparency and Consent Framework (TCF) support the CTV environment. The guide notes growing interest in TCF implementation in CTV, with more CMPs actively seeking validation to operate in this environment. IAB Europe's 2025 TCF Compliance Report documented that CMPs supporting web, mobile, and connected television simultaneously grew from 4.8% to 6.6% of registered CMPs in 2025, a slow but consistent shift as publishers extend their digital properties into native app and CTV environments.

Six ad formats, standardised

The guide's treatment of ad formats reflects work done by the IAB Tech Lab's CTV Ad Portfolio, which the guide describes as developed from more than 100 real-world submissions. The portfolio provides consistent definitions and OpenRTB guidance for six native CTV formats that exist outside traditional commercial breaks. IAB Tech Lab released those CTV ad format standards for public comment in December 2025, with the comment period running through January 31, 2026.

The six formats are: pause ads, menu ads, screensaver ads, in-scene ads, squeezebacks, and overlays.

Pause ads are triggered when viewers pause content. Typically static or lightly animated, often with QR codes, they monetise a natural break without interrupting playback. Menu ads appear within navigation environments such as home screens, rails, or carousels, and often remain on screen longer than traditional ads, influencing how attention and frequency are evaluated. Screensaver ads are displayed when the TV or app enters an idle state - full-screen, high-impact branding units initiated by the system rather than the viewer, with implications for measurement and viewability. In-scene ads are integrated directly into content, such as virtual product placement or contextual signage, increasingly transacted via programmatic guaranteed or deals. Squeezebacks resize the primary video into a smaller window while an ad occupies the remaining screen, sitting between video and display logic. Overlays are non-linear ads occurring during program content and outside of the traditional ad break, placed over the content, often as a banner or picture-in-picture execution. Overlays may support viewer interaction via remote control or QR code.

Early real-world results from these formats are visible in the market. Wunderkind launched programmatic CTV pause ads in July 2025, reducing store visit costs by 79% through QR code integration. A subsequent campaign for jewellery retailer Zales generated a 276% increase in QR code scans compared to previous larger-budgeted campaigns.

Media quality: fraud, transparency, and device attestation

The guide's section on media quality is where some of its more striking figures appear. According to the document, 15% to 25% of total global ad spend is currently lost to fraud, with CTV and mobile in-app environments being heavily affected compared to traditional web channels. Global invalid traffic rates doubled between Q3 2023 and Q3 2025.

Two real-world fraud cases are detailed. The first is PARETO, in which nearly one million infected Android devices generated invalid traffic while spoofing CTV environments, producing an average of 650 million bid requests per day. The guide notes this was observed by HUMAN Security and disrupted in coordination with ecosystem partners including Roku and Google. The second is BADBOX 2.0, described by HUMAN's Satori team as an operation rooted in backdoors on low-cost, off-brand consumer devices. The activity supported multiple abuse schemes including advertising fraud and was observed across 222 countries and territories. The key lesson the guide draws from BADBOX 2.0 is that media quality controls need to account for device integrity and upstream supply-chain risk - and cannot rely solely on classic ad-tech signals, because tactics like residential proxies can make abusive traffic appear more like legitimate user activity.

The document also addresses a specific quality problem: some CTV apps continue streaming content and firing ad impressions even after the TV has been switched off, because they do not properly respond to device-level screen-off signals. This results in impressions with no opportunity to be seen, inflating performance metrics.

On the verification side, the guide explains how the IAB Tech Lab's Open Measurement SDK (OM SDK) and device attestation address these threats. The OM SDK executes native code at runtime on the client device or app to measure ad viewability, duration, and playback completion. It is integrated directly into the native app or CTV player and relies on standard signals passed via AdVerification nodes within VAST (Video Ad Serving Template) tags, providing measurement vendors with signals on device and session state including TV power status. For device spoofing, the OM SDK now supports device attestation based on the IETF Privacy Pass Protocol. Device attestation cryptographically verifies that a programmatic bid request originated from a legitimate CTV hardware device rather than a server farm, without passing personally identifiable information to the ad server.

Measurement: beyond CPM

The final substantive section of the guide addresses measurement. The core argument is that CPM alone is not a reliable proxy for value in CTV. According to the document, more meaningful indicators include incremental reach, frequency distribution, completion-rate stability, attention-weighted exposure, and outcome-based proxies that reflect how viewers actually engage with TV-like environments.

CTV measurement is heavily influenced by SSAI, which limits the use of client-side tags that underpin verification in other channels. Measurement often depends on server logs, platform-level reporting, and pre-agreed verification scopes rather than real-time client signals. The guide is direct in its implication: buyers and sellers must align on what can and cannot be measured before a campaign launches, not after.

IAB Europe's inaugural Attitudes to Digital Advertising Report in January 2026 found that nearly 70% of respondents identified CTV as a top opportunity, with brand metrics reaching 36% importance for CTV evaluation and attention metrics at 27%. That same survey found 70% of advertisers frustrated with performance measurement - a figure that underscores why the measurement section of this guide is likely to receive particular attention from planning teams.

Case studies: Czech and German markets

The guide includes three case studies that ground its technical guidance in operational reality. A Czech campaign by Adform, OMC Czech Republic, Skylink (Canal+), and FTV Prima demonstrated how sequential storytelling across CTV and the open web could be made to work programmatically. The team activated FTV Prima's CTV supply through Adform's unified buy-and-sell-side technology and used CTV-based identifiers to retarget viewers across the open web. The retargeting reach achieved equalled 11.2% of the original CTV audience. Adform's ID Fusion expanded that reach 8.4 times, delivering 93.7% total online reach. A second German case study, for fashion retailer Breuninger, found that users reached via CTV drove 57% of all conversions in a campaign run through the Adform DSP.

A third case study from the Czech market involved Tivio Studio, which integrated programmatic capabilities into linear TV as part of a CSOB campaign within the KBC Group, executed with Publicis Groupe Czech Republic. The activation achieved a 99% Video Completion Rate and 99% HD or Full HD rendering quality. According to the guide, advertisers can now reach more than three million households across the Czech Republic through programmatically enabled linear TV.

Why this matters

The guide arrives at a moment when programmatic CTV is attracting significant budget reallocation from linear television but still lacks the operational infrastructure that would make that reallocation efficient and trustworthy. FAST channels reached 27% household adoption across Europe by March 2026, with free, ad-supported alternatives filling gaps as subscription fatigue limits further SVOD growth. Programmatic CTV budgets grew to 26% of media spend in 2026, up three percentage points year-over-year, with more than half of marketers expecting over 60% of CTV buys to occur programmatically during the year. The Ventura Ecosystem, launched by The Trade Desk in February 2026, is one indicator of how platforms are moving to consolidate CTV supply paths.

For marketing and media buying teams operating in Europe, the practical value of the guide is its specificity. It names the technical standards that matter - OpenRTB, SSAI, app-ads.txt, sellers.json, ACIF, OM SDK, TCF. It quantifies the fraud problem. It distinguishes deterministic from modelled data in a regulatory context that makes that distinction consequential. And it gives concrete definitions to ad formats that have existed in the market under inconsistent naming, making cross-publisher planning harder than it needs to be.

IAB Europe's CTV and Programmatic Working Groups developed the guide with contributions from Adform, Comcast Advertising, DoubleVerify, Human Security, IAB UK, Index Exchange, WPP Media Futures Group, Nexxen, and Verve.

Timeline

Summary

Who: IAB Europe, a Brussels-based trade association representing the European digital marketing and advertising ecosystem. The guide was developed by the CTV Working Group and Programmatic Working Group, with contributions from Adform, Comcast Advertising, DoubleVerify, Human Security, IAB UK, Index Exchange, WPP Media Futures Group, Nexxen, and Verve.

What: IAB Europe published its Guide to Programmatic for CTV, a multi-section document covering the programmatic CTV ecosystem, technical standards including SSAI and OpenRTB, data and targeting frameworks, the IAB Tech Lab's six-format CTV Ad Portfolio, media quality and fraud - including the PARETO and BADBOX 2.0 cases - and measurement considerations adapted for streaming environments. The guide records 18 CMPs validated for CTV and 466 vendors registered to the TCF supporting CTV environments.

When: The guide was published in April 2026, on April 4, 2026.

Where: The guide is published by IAB Europe and available at iabeurope.eu. It covers the European programmatic CTV market specifically, with case studies from Czech and German campaigns and a section on HbbTV as a European-specific technical consideration.

Why: European CTV consumption grew sharply in 2024, with SVOD up more than 200% and BVOD up nearly 30%, but the market continues to lack consistent definitions, technical standards, and measurement frameworks. Fraud rates in CTV are estimated to account for 15% to 25% of global ad spend. Programmatic CTV budgets are growing rapidly - reaching 26% of media spend in 2026 - but without shared language and standards, cross-publisher planning remains operationally difficult. The guide represents IAB Europe's effort to provide that foundation before fragmentation compounds further.

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