I do this with software that needs a CD all the time. I travel a lot and its not feasable for me to carry around a bundle of CDs cause some company is paranoid about piracy so what I do is:
Insert the disk, drag and drop it onto the "Disk Utility" icon, it then asks you what you would like to save it as, make it a .cdr file (dvd/cd remaster) and then itll make a file and save it wherever you put it. Not sure if itll work for you but it does for me.