Inside ATLOCK v4: A Deep Technical Teardown TL;DR — ATLOCK is a ~3,000-line, single-file Python security suite for Windows that combines OS-level lockdown, NTFS ACL file locking, a Fernet/PBKDF2-encrypted password vault, and webcam-based intruder response — all wrapped in a customtkinter UI and shipped as one .exe. This post breaks down how it's built, why certain decisions were made, and — just as importantly — where the trade-offs are, because a security tool that hides its own weak points ...