Before I try to login tom the App store on other devices (family, friends) and share the apps that vie purchased, I'd like to confirm that I am actually allowed to share purchases. For example, I've purchased the MLB at bat 2011 app for I believe $14.99. Can I simply login to the mac app store on any other device and confirm my account and purchase again and then device has full individual access to the app? I just want to make sure that I won't get billed again for it. If I can do this, I was wondering why Apple would allow it and not restrict it to just one device. Also, once I login on another device, does that mean that the device will have full access to my account and can make purchases with it? Thanks.