Case Study: Kalsefer Digital Solutions achieves cross-platform DRM security and 50% fewer support cases with PDFTron

How Kalsefer Streamlined Cross-Platform DRM Security With PDFTron SDK

Kalsefer Digital Solutions (classoos) is an edtech startup that delivers K‑12 PDF textbooks to over 50,000 students and teachers each semester. Facing growth, the company needed robust, cross‑platform DRM and a single SDK to support web, Windows, iOS and Android; their previous solution forced students to use Adobe IDs (creating ~50% of support tickets), imposed restrictive licensing, and increased operational burden.

Kalsefer adopted PDFTron (Core SDK, WebViewer, Xamarin and UWP) to enable server‑side encryption without Adobe IDs, stream linearized PDFs in the browser, and provide encrypted offline downloads on mobile. The switch halved support caseload, lowered operating costs and textbook prices, streamlined cross‑platform development with one vendor, and delivered secure, uninterrupted reading across devices.