"to study or analyze (a device, as a microchip for computers) in order to learn details of design, construction, and operation, perhaps to produce a copy or an

"to study or analyze (a device, as a microchip for computers) in order to learn details of design, construction, and operation, perhaps to produce a copy or an improved version" Isn't that what has happened here? They decompiled the program and gave each function and variable a meaningful name, added comments and fixed some bugs.