AMSTERDAM (Reuters) - Dutch navigation device maker TomTom (TOM2.AS: Quote, Profile, Research) sought on Tuesday to assure customers of digital map maker Tele Atlas (TA.AS: Quote, Profile, Research) that their trade secrets would be safe once TomTom buys the company.

The European Commission is concerned TomTom's 2.9 billion euro ($4.2 billion) takeover of Tele Atlas could harm competition and is scrutinizing the deal. U.S. competition authorities approved the planned deal in October.