To use any torrent for publically available data, it is not illegal. But Most of the torrent sites, including KAT, deliver copyright material without taking permission from its creator. In most of the countries, it is illegal to download unlicensed content. From the law perspective, it seems to be an unlawful activity. But there are too many backdoors available to bypass it whether using a VPN or any third-party proxy service, which can hide your device information.