What is the fine-grained topic of the following text: Under the settlement, Semafone has granted a worldwide licence to their granted patents, trademarks and patent applications covering certain dual tone multi-frequency (“DTMF”) masking methods of taking secure payments over the phone, for the benefit of Eckoh, its customers and suppliers. Only return the topic.
Worldwide intellectual property licensing agreement between Semafone and Eckoh over DTMF masking methods for secure phone payments.