Yes, Sibelius or Finale means that you copy the score (of course some scanning software can scan the paper-printed score into midi and then open it with music score editing software or music workstation software such as Sibelius or Finale). It plays for you, and it knows many ways to play, even symphonic or modern music.
There are many music workstation software with staff functions, such as Sonar, Logic, Pro Tools, Cubase, Nuendo, etc.
All of the above are cracked!
The last sentence is very important. It depends on what your focus is. If the layout of the music score is the main focus, use Sibelius or Finale.
If you mainly produce music with computers, it would be Sonar, Logic, Pro Tools, Cubase, Nuendo, etc.