XSecureLock is an X11 screen lock utility designed with the primary goal of security. Screen lock utilities are widespread. However, in the past they often had security issues regarding authentication bypass (a crashing screen locker would unlock the screen), information disclosure (notifications may appear on top of the screen saver), or sometimes even worse. In XSecureLock, security is achieved using a modular design to avoid the usual pitfalls of screen locking utility design on X11. pandoc-bin (listed in REQUIRES) is required for generating man pages. mpv is additionally required for building (and running) the saver_mpv module (which plays video clips in $HOME/Videos).