MLB At Bat 2012 - one account for BB and iPad?

I would like to download and use the MLB At Bat 2012 app on both my bb Bold 9900 and the family iPad. But it seems I will have to pay for both to get the access to streaming audio on both devices. As anyone been successful sharing the same MLB account between both devices, like you can between Android and Apple devices? If so, please let me know what procedures to use so that I can avoid paying double for both of these apps.

Thanks!

Shane