Google has lodged its legal appeal against the European Commission’s €4.34 billion (~$5BN) antitrust ruling against its Android mobile OS, according to Reuters — the first step in a process that could keep its lawyers busy for years to come.

“We have now filed our appeal of the EC’s Android decision at the General Court of the EU,” it told the news agency, via email.

We’ve reached out to Google for comment on the appeals process.

Rulings made by the EU’s General Court in Luxembourg can be appealed to the top court, the Court of Justice of the European Union, but only on points of law.

Europe’s competition commissioner, Margrethe Vestager, announced the record-breaking antitrust penalty for Android in July, following more than two years of investigation of the company’s practices around its smartphone operating system.

Vestager said Google had abused the regional dominance of its smartphone platform by requiring that manufacturers pre-install other Google apps as a condition for being able to license the Play Store.

She also found the company had made payments to some manufacturers and mobile network operators in exchange for them exclusively pre-installing Google Search on their devices, and used Google Play licensing to prevent manufacturers from selling devices based on Android forks — which would not have to include Google services and, in Vestager’s view, “could have provided a platform for rival search engines as well as other app developers to thrive”.

Google rejected the Commission’s findings and said it would appeal.

In a blog post at the time, Google CEO Sundar Pichai argued the contrary — claiming the Android ecosystem has “created more choice, not less” for consumers, and saying the Commission ruling “ignores the new breadth of choice and clear evidence about how people use their phones today”.

According to Reuters the company reiterated its earlier arguments in reference to the appeal.

A spokesperson for the EC told us simply: “The Commission will defend its decision in Court.”