The European Commission said today it had accepted commitments by US online retailer Amazon to alter its e-book contracts with publishers to end an EU competition investigation. 

Amazon, the biggest e-book distributor in Europe, proposed to drop some clauses in its contracts so publishers would not be forced to give it terms as good as those for rivals. 

Such clauses relate to business models, release dates, catalogues of e-books, features of e-books, promotions, agency prices, agency commissions and wholesale prices. 

"Today's decision will open the way for publishers and competitors to develop innovative services for e-books, increasing choice and competition to the benefit of European consumers," EU competition chief Margrethe Vestager said. 

"We want to ensure fair competition in Europe's e-books market worth more than €1 billion," she continued in a statement.

Amazon said it was pleased to reach an agreement with the Commission. 

The Commission opened an investigation into the company's e-books in English and German in June 2015, concerned that such parity clauses made it harder for other e-book retailers to compete with Amazon by developing new and innovative products and services. 

Amazon made its offer of concessions in January. The commitments apply for five years in Europe.

The EU competition enforcer then gave rivals and customers a month to provide feedback before it decides whether to accept the proposal. 

Under EU competition rules, such settlements mean no finding of infringement nor fines which could reach 10% of a company's global turnover. 

The Commission is also probing Amazon over its arrangement with Luxembourg to minimise its tax bill, part of a crackdown on such deals in the 28-country bloc.