No, you can´t.
Each license is for 1 domain (Live and Dev).
If I have 1 License, I can set the Live domain (for public site) and the Dev domain (for testing only).
Ex.
My live domain is: ijoomla.com.
I need iJoomla Magazine on my main domain and its subdomains: ijoomla.com, sub1.ijoomla.com, sub2.ijoomla.com, etc.
In order to be able to have this I need 1 joomla installation for each instance (ijoomla.com, sub1.ijoomla.com, sub2.ijoomla.com, etc) and on each one, I need a iJoomla Magazine installation.
When I go to download the package, I will see 2 sort of downloads: LIVE and DEV. Click on LIVE and fill the live domain for the license (ijoomla.com) then, fill the subdomains for that license on your LIVE site (sub1, sub2, etc). And that´s all. This download will work on your ijoomla.com, sub1 and sub2 sites.
Please read this thread for more references...Each iJoomla Magazine License supports as many magazines, issues and articles as you need. But all of them need to be on the same domain or subdomain.
Best regards,
Note: please, don´t confuse iJoomla Magazine component with magazines per se. The magazines are like sections and the issues are like categories.