To restrict users on an OTT platform and limit simultaneous streams per account (e.g., 3 streams per user), you need a concurrent stream management system integrated into your online video platform. Here’s how you can achieve this:

1. Implement Multi-Device Login Control Use session management to track active logins and enforce device restrictions per account. If a user exceeds the limit, they must log out from another device.

2. Concurrent Stream Restriction Deploy a stream concurrency control feature that allows only a set number of active streams per account. Once the limit is reached, additional streams are blocked.

3. Token-Based Authentication Secure access by using unique streaming tokens for each session. When a user tries to exceed the allowed limit, the system denies token generation for the extra session.

4. DRM-Based Access Management Integrate Digital Rights Management (DRM) solutions like Vplayed, Widevine, FairPlay, or PlayReady to enforce playback restrictions based on user profiles.