No. 10 of 22 ·Lockdown Browser Software

OpenLock

Linux

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Freedom report

One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

OpenLock is ranked #10 of 22 in lockdown browser software on Freedom251. It runs on Linux.

Compared on lockdown browser software

Free plan: Yes
Supported platforms: Linux
Blocks app switching: Yes
Blocks copy and printing: Yes
Blocks screen capture: Yes

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The record

Purpose: OpenLock is an open-source lockdown exam browser for Linux intended to bring Safe Exam Browser style exam lockdown to Linux distributions.
Exam status: The project says it is not exam-ready because its SEB key derivation is not byte-exact and has not been validated against a live LMS.
SEB protocol: It parses .seb configuration files and attaches Browser Exam Key and Config Key headers to requests, but the project says these keys currently will not match an LMS handshake.
Kiosk mode: Its kiosk mode uses fullscreen takeover via X11 override-redirect or a Wayland/Cage compositor.
Process protection: A process guard monitors and kills prohibited processes such as screen recorders, virtual machines and remote desktop software.
Input restrictions: Input lockdown blocks shortcuts including Alt+Tab, Alt+F4, Ctrl+C and PrintScreen, as well as clipboard use.
Browser restrictions: Browser hardening disables DevTools, View Source, downloads, right-click, console and drag-and-drop.
Integrity checks: The project lists VM, debugger and hypervisor detection, plus optional self-hash verification, as security measures.
Navigation controls: OpenLock supports URL whitelist and blacklist filtering and navigation policy enforcement.
LMS integrations: The project lists adapters for Moodle, Canvas and Blackboard, but says it has not been tested against live instances of those LMS platforms.
Data handling: The security model specifies an off-the-record browser profile with no persistent storage and permissions denied by default.
Linux requirements: The stated prerequisites include Ubuntu 22.04 or later, Fedora 38 or later, or Arch Linux, along with Qt6 and QtWebEngine.
Distribution packaging: AppImage, .deb, .rpm and Flatpak packaging are listed as planned rather than available releases.
License: The repository says the project follows the Mozilla Public License 2.0 and allows proprietary use if modifications to MPL-licensed files remain open.

Where it ranks on Freedom251

Best Lockdown Browser Software in 2026#10 of 22

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Sources

github.com/oneKn8/openlock_browser· checked 30 Sept 2026