Information Broadcasting - need for additional Licensing?

One of the key features that is prompting us to upgrade to BW 3.5 later this year is the Information Broadcasting functionality.

This will allow us to easily push reports directly to our user base rather than the traditional method of manually emailing workbooks. However will this generate a need for additional licences? From the testing we have performed so far in order to broadcast a report the receiving user needs to have an account in BW together with the email in the address book.

We will have a considerable number of users whose only interaction with BW will be to receive a report that has been broadcasted. Does anyone have any experience of this same issue?

any help/advice appreciated.

thanks

Mike