I understand that you want to know how to transfer the Mobile license from a BlackBerry Mobile device to a Toshiba Thrive tablet.
Unfortunately, it is not possible. The main issue is that these devices run on different platforms, therefore you will not be able to and you will need to purchase the SlingPlayer for Android tablets license, which is available through the Google Play Store.
The following links will provide you with further details and the options you have:
Hope this helps!