Who owns the created Prezi

I just had a very interesting conversation the other day about Prezi. One of the main questions that came up was: who owns the created presentation, because of the cloud feature. This is an important question for those who work in academia and want to present their own data or using sensitive data which cannot be distributed to a third party.
I hope it makes any sense.
Thank you for your help.

Anything you create with Prezi, you own. On free accounts, Prezi has the rights to use your content in things like advertising, or marketing materials, if the presentation isn’t private. But you still own it, to do with it as you wish. Please refer to our Terms of Use for more details.