With Takedown Scoring and Stats release 2.4, you have the option to score unlimited matches for various time periods, currently one year and one week.
These subscriptions are valid on any iPad registered to the original purchaser (identified by Apple ID) without additional charge. This feature -- no fee use on multiple iPads -- will be a savings boon to about one-third of our users who deploy multiple iPads for scoring.
The seven day score unlimited matches subscription is intended for those who want to intensively "kick-the-tires" for a week. It can also be used to deploy multiple iPads for scoring a tournament in the case where all of the iPads aren't registered to the same Apple ID.
Here's a tutorial on purchasing the Score Unlimited Matches for one year subscription. It also shows how simple it is to use a single subscription on multiple iPads (registered to the original purchaser).