How to stop account sharing in your online courses
How shared logins spread through roommates, group buys, resale and forwarded OTPs, why device limits and password changes fall short, and what to ask.
Ideas & updates
The Upclass Blog
Security, piracy and engineering deep dives, plus practical ideas for growing your institute. From the team building Upclass.
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WebRTC vs HLS for live classes: latency, scale and cost
Sub-second WebRTC or CDN-scale HLS? Latency budgets for live classes, SFUs, Low-Latency HLS, RTMP vs SRT ingest, the cost of a 5,000-student class and a hybrid design.
How to prevent video downloads from your website
Most course video downloads use ordinary gaps: plain file links, download tools, keys any session can fetch and shared logins. What fails, the warning signs and what to ask.
SSL pinning: what it is and does your app need it?
How attackers intercept and tamper with mobile apps, what SSL pinning does about it, why apps need hardening too, and the limits that can lock users out.
Multi-CDN and CDN failover for video platforms
Why one CDN is a single point of failure on exam and launch days, how DNS, player-side and content-steering failover compare, and what must match across CDNs.
What is end-to-end encryption, and how does it work?
End-to-end encryption keeps the keys on your devices, so even the service can't read your messages. How it works, how WhatsApp, Signal and Telegram differ, and what it means for leaks.
Are unlisted YouTube videos safe for paid courses?
Unlisted hides a video from search, not from anyone with the link. What unlisted really means, how links leak, YouTube's rules on paid embeds, and when to move on.
Message queues and background jobs: Celery, Redis, Kafka
Move slow work off the request path: queues vs brokers vs streams, Celery in Django, retries and idempotency, dead letters, separate queues, and when Kafka is worth it.
Secure video hosting for online courses: what to look for
Where 'secure' video hosting falls short: keys any session can fetch, shareable links, untraceable copies, unchecked recording and lock-in, plus a vendor scorecard.
Monitoring vs observability: logs, metrics, traces and SLOs
What monitoring and observability each answer, how logs, metrics and traces fit together with OpenTelemetry, and how to set SLOs and error budgets around student journeys.
JWT vs session authentication: which should you use?
Sessions end a login instantly; JWTs skip the database lookup. How each works, why revocation decides it for device limits and forced logout, and a hybrid for web and apps.
Signed URLs and hotlink protection for video, explained
How signed links and hotlink protection get bypassed: links shared before expiry, valid sessions, leaked secrets, public storage and faked Referer headers.
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