A digital publication is an adapted version of a printed publication that you access on-line and paid through subscription, donations or advertising.
In Australia, the Morning Bulletin in Rockhampton, Queensland is the only digital newspaper circulation currently audited.
Probably this is why on their website you can see a stress on the digital publication.
http://www.themorningbulletin.com.au/
its paper circulation is
18,474 Mon - Sat#
25,296 Sat#
Interestingly though the sale of digital editions is small as “the Morning Bulletin reported 14 sales of its weekday digital edition in the three months to June and 26 sales on Saturdays.
The most it has sold since July last year was 26 copies on weekdays and 40 copies of Saturdays.”
Do the math’s yourself!