EU antitrust regulators launched proceedings on Thursday to ensure that Apple complies with landmark rules requiring it to open up its closed ecosystem to rivals or risk a possible hefty fine.Under the so-called specification proceedings,

The EU said Apple must make sure devices made by rivals work with its iPhones and iOS operating systems in accordance with the Digital Markets Act

The European Union’s executive arm has started a process to provide Apple with guidance on how the iPhone maker can comply with rules to ensure its operating systems are functional with other technologies.

EU authorities say Apple has failed to come into compliance with the Digital Markets Act, a newly enacted regulation aimed at large tech companies.

EU antitrust regulators launched proceedings on Thursday to ensure that Apple complies with landmark rules requiring it to open up its closed ecosystem to rivals or risk a possible hefty fine.

Apple just received a very clear message that it still has a lot to do if it hopes to comply with Europe's new digital antitrust rules. Why it matters: The tech giant, which has built its entire business around its own closed-world ecosystem,