https://www.rockler.com/rockler-blade-lock-blade-changing-tool
<p>Built-in clamp grabs the plate of your table saw's 10'' blade to make blade changing easy—designed for saws without arbor locks...
lock changingbladetool
https://owncloud.com/security-advisories/security-lock-can-be-bypassed-by-changing-the-system-date/
Given an attacker has physical access to the device, a faulty timestamp check allowed to bypass the app lock by setting the system date to the past.
security locksystem datebypassedchanging