We purchased a disc and 3 licences over 12 months ago and we would like to add the program to 3 more computers. Do we have to purchase another disc or can we purchase licences without additional CD-ROMs?

There is no need to purchase additional disks as the disks (CD-ROMs) are only used to install the program. To run the program on 3 additional machines, 3 additional digital licences will need to be purchased. More information on individual licence pricing may be found here:

http://www.readingdoctor.com.au/Multiple_License_Discounts.html

Hope that helps!