I'm really sorry for the inconvenience. I'll check with Infraon and get back to you. And if I may ask, are you using the iOS app that was released this time? Or are you using the web app via mobile?

I got a response from Inflearn. We have confirmed that the current student is watching the lecture on the mobile web. In the case of the mobile web, if it is not iOS 17 version, the lecture with DRM applied will not run. So we suggest updating to iOS 17 version or using the iOS app. We apologize again for the inconvenience in taking the class.