Earlier quoted context omitted.
Software is already covered by copyright. Granting it parent protection as well allows software companies to double dip in a way that no other industry can.
That's certainly not true. You can protect a manufacturing process via patent, and also protect a manual on the manufacturing process via copyright. Further, you can protect machinery within the manufacturing process via patent, and also protect a manual on the machinery via copyright. This parallels software coverage. You can protect the process (the executed code resulting in affirmative steps) and the manual (the…
If a physical machine is not under patent protection you can strait up copy it and start manufacturing your own version. With software you have to go through an extra "clean room" step to get around copyright. In practice the clean room reverse engineering process is rarely utilized because it is expensive and fraught with the risk of a lawsuit from the copyright owner.