It depends on different streaming platforms.

If this streaming platform is free platform, you don't need a subscription to download videos. If this streaming platform requires a subscription, then you can use KeepStreams to download the videos only after subscribing.

The prerequisite for KeepStreams to provide a video download service is that streaming platforms grant you the right to watch their videos.

If you have any questions about how to subscribe to streaming services, please contact the customer service of streaming platforms.