Very! Presentation mini-sites are private, password protected, and you control who is permitted to view it. There are no public links to presentations.
You can even control if the participants can see the results of the voting or if that information is only shared with you.
More than that, presentation mini-sites are NOT affiliated with crowdspring in any way - visual or otherwise. Crowdspring respects our agency clients and does not collect any information from presentation mini-sites. Agencies have trusted us for the past 11 years because of this commitment.