An anonymous reader writes: Germany's Axel Springer, owner of newspapers like Bild and Die Welt, is pursuing legal action against the developers of Blockr, an ad blocker for iOS 9. Techcrunch reports: "In October, Axel Springer forced visitors to Bild to turn off their ad blockers or pay a monthly fee to continue using the site. Earlier this month, the publisher reported the success of this measure, saying that the proportion of readers using ad blockers dropped from 23% to the single digits when faced with the choice to turn off the software or pay. 'The results are beyond our expectations,' said Springer chief exec Mathias Döpfner at the time. 'Over two-thirds of the users concerned switched off their adblocker.' He also noted that the Bild.de website received an additional 3 million visits from users who could now see the ads in the first two weeks of the experiment going live."