Remote File Control Without Cloud

Lightweight Sharing of Locally Encrypted PDFs

Why Choose "Offline Storage + Online Authorization"?

Traditional Cloud Storage: Data stays with third parties, high compliance pressure.
Pure Local Encryption: Once sent, it's out of control, cannot be revoked.
Professional DRM Platforms: Complex deployment, high costs.

PDFs are encapsulated into a single HTML file, easily copied to USB drives or private NAS.

Background handshake upon opening: verifies reading code, remaining uses, and expiration date. Offline → direct denial of launch.