Earlier quoted context omitted.
This. Music, film, and text are static. Software is dynamic.
To be pedantic, requirements are dynamic. Software is a reflection of that. However, the fact that software can readily embrace dynamism, can make it a self fulfilling prophecy. But back when games were shipped on CD or burned into ROM cartridges, it was much more of a ship it and it’s DONE process and culture.
What I meant is that software is interactive, while a video, for example, is not, it's static in the sense that it will always played in the same way.