Distribuiting our fonts is allowed only for noncommercial uses.

That means you can pass them to friends to try and use for non-commercial purposes, and try and install freely as many copies you want to test the design.
You can spread the word of Zetafont and have good karma back. But no reselling or inclusion of our fonts in print, web or cd compilations (free or paid) is allowed without permission. Our fonts cannot be purchased for the purpose of resale. 

If you have personal or studio license, you are allowed to pass the files to your service bureau for printing. The broadcast license and worldwide license allow redistribution of our fonts to all the employees of the licensed corporation.