Edward Kiledjian

Publishers say ad blockers erode journalism's financial foundation. Privacy advocates argue they protect users from tracking and malware. Germany's highest court has just reignited this debate with far-reaching implications.

German publisher Axel Springer has revived its decade-long dispute with Eyeo GmbH, developer of Adblock Plus. On July 31, the German Federal Court of Justice referred the case back to the Hamburg Higher Regional Court, asking it to re-examine copyright questions tied to how browser extensions process website content.

The Evolution of Legal Strategy

The dispute began in 2015 when Springer challenged ad-blocking technology, claiming it undermines advertising revenue needed to sustain free online journalism. The Federal Court of Justice rejected those arguments in 2018, affirming users' right to control their browsing experience. Springer then shifted to copyright, arguing that ad blockers illegally modify website code by altering browser-generated data structures such as DOM trees and CSS objects.

Lower courts dismissed these claims in 2022 and 2023. The Federal Court's latest ruling keeps the matter alive, finding that Hamburg had not sufficiently examined whether website code qualifies as a computer program under German copyright law.

Technical Complexities at the Core

Eyeo maintains its tools operate only on users' devices, filtering content locally without altering server-side code. Supporters highlight benefits including privacy protection and reduced exposure to malicious advertising.

The case now centres on how browsers process website content. Judges must decide whether interpreting code through virtual machines and bytecode qualifies that code as protected software — and whether blocking ads constitutes unauthorized modification.

Broader Implications for Digital Rights

Mozilla has warned that restricting ad blockers could stifle innovation in privacy, accessibility and security tools. Malvertising incidents, in which compromised ads on major news sites spread malware, illustrate the role of blockers in protecting users from security threats.

"This case is about so much more than ad blocking: it puts the privacy and security of millions of users at risk," said Cornelius Witt, Director of Global Public Affairs at Eyeo. "If the claims made by Axel Springer were upheld, blocking invasive trackers, changing font sizes for readability or even zooming in on a webpage might be construed as copyright violations."

Springer counters that widespread ad blocking undermines the economics of independent media. Its legal team argues that when Adblock Plus blocks or modifies website code in users' browsers, it interferes with the intended presentation of content and amounts to unauthorized modification.

What's Next

The case now returns to Hamburg for further examination. For now, ad blocking remains lawful in Germany, but the next ruling could influence how privacy rights and advertising revenue are balanced across the European Union. The decision may also affect cloud applications, browser-based games and enterprise software that rely on similar web technologies.

The outcome could redefine how European courts balance user autonomy, privacy and the financial realities of online media. I welcome your perspectives in the comments.