That is a good question for their customer support contact form. I check their FAQ and it had only two questions! Just two? Yes.
I did find a note that said Adobe was required for downloading and printing any corrections to patterns. The sample issue is provided via Adobe Flash player. I don't think you can download that, but it does let you print pages from it. It had a rather nice print interface that let you check mark the pages you wanted to print.
Oh, on the page you linked is the following quote:
With Creative Knitting digital, you get immediate and free delivery of each issue, the ability to save and reference your issues anytime and anywhere (online and offline), and a paperless reading experience with high-resolution quality!
I added the emphasis to point out it says save and offline. That means (IMHO) you can download to your own computer and view and print anytime from there. Copyright restrictions still apply.