The Secure Media Link authentication app is an application that uses the NFC function of your smartphone to authenticate items equipped with FeliCa Secure ID. The Secure Media Link authentication app allows you to use services using Secure Media Link with a web browser.

For FeliCa secure ID, please refer to the page below.
https://www.sony.co.jp/Products/felica/business/products/iccard/RC-S120.html

Secure Media Link is a service provided by Sony that allows you to manage items equipped with FeliCa Secure ID and the data associated with those items on the cloud.