A recent ruling by the German Federal Court of Justice (BGH) has reopened the possibility that using ad blocking software could violate copyright law in Germany.
In a decision last month, the BGH – the final court of appeals on civil and criminal matters – partially overturned an appeals court decision in an 11-year copyright dispute brought by publisher Axel Springer against Adblock Plus maker Eyeo GmbH.
The ruling says that the appeals court erred when it determined that the use of ad blocking software does not infringe on a copyright holder's exclusive right to modify a computer program.
Springer has argued – unsuccessfully so far – that its website code falls under the control of the German Copyright Act. So modifying the web page's Document Object Model (DOM) or Cascading Style Sheets – a common way to alter or remove web page elements – represents copyright infringement under the company's interpretation of the law.
The appellate court that initially heard and rejected that argument will now have to revisit the matter, a process likely to add several years to a case that Eyeo believed was settled seven years ago.
Eyeo did not immediately respond to a request for comment. While it offers ad blocking software, the company generates revenue from ads through its Acceptable Ads program – advertisers pay to have ads that are "respectful, nonintrusive and relevant" exempted from filtering. Non-commercial open source projects like uBlock Origin rely on community support.
Philipp-Christian Thomale, senior legal counsel for Axel Springer, celebrated the ruling in a post to LinkedIn, calling it "a true milestone in the copyright protection of software – especially with regard to cloud-based applications (SaaS)."
Among the implications, he argues, is that "software providers will be better equipped to defend against manipulation by third-party software."
While the outcome remains undecided, Mozilla senior IP & product counsel Daniel Nazer worries that if the German courts ultimately uphold the copyright claim, that will hinder user choice on the internet.
"We sincerely hope that Germany does not become the second jurisdiction (after China) to ban ad blockers," he wrote in a blog post on Thursday.
"This will significantly limit users’ ability to control their online environment and potentially open the door to similar restrictions elsewhere. Such a precedent could embolden legal challenges against other extensions that protect privacy, enhance accessibility, or improve security."




