Hi,
The AudioLabel license is per user, so it's OK to install AudioLabel on more than one computer (as long as you are the only user).
There is one problem though; AudioLabel is only compatible with the Windows operating system (not the Mac / iPad).
It is possible to run AudioLabel on your iPad, but you would have to install 3rd party software that runs windows in the background:
http://www.vmware.com/products/fusion/http://www.parallels.com/products/desktop/