i3lock improves slock by making it fork() and therefore combinable with commands to suspend your computer. Additionally, instead of turning off your screen via DPMS and/or displaying a black screen, i3lock displays a white screen so you can see if your computer failed to resume from suspend or if your screen is just locked. Also, when entering a wrong password, i3lock does not call XBell(). This is important because i3lock/slock think you've entered a password when resuming from suspend, at least sometimes.
Binary packages can be installed with the high-level tool pkgin (which can be installed with pkg_add) or pkg_add(1) (installed by default). The NetBSD packages collection is also designed to permit easy installation from source.
The pkg_admin audit command locates any installed package which has been mentioned in security advisories as having vulnerabilities.
Please note the vulnerabilities database might not be fully accurate, and not every bug is exploitable with every configuration.
Problem reports, updates or suggestions for this package should be reported with send-pr.