You still needed programs like Copy ][+ and Locksmith. For example, common strategies were half and quarter track writes: shifting the head a small amount, whic

You still needed programs like Copy ][+ and Locksmith. For example, common strategies were half and quarter track writes: shifting the head a small amount, which makes the disk unreadable by the system function calls, but not by its own bootloader, which is why it could run but you couldn't copy the disk with the Dos 3.3 tools (or ProDOS tools). The two programs I mentioned could be configured to offset the head, allowing you to "break" the protection.