View powerpoint online while prevent users from saving it

My company currently has a number of powerpoint-based trainings. While we want these to be accessible and viewable by our client, we do not wish for our client to be able to distribute the material. While we have expressed the need to keep the material private and applied the appropriate markings, there has been at least one occasion in the past through a simple mistake, the material landed in the hands of one of our competitors. Because it's a large client, we're hesistant to rock the boat.

My current thought is to host the powerpoints on our site, accessible only by those who have a login and that the site makes it more difficult take a screen capture or to save the page source (I get this isn't a full-proof solution, but will geatly limit the number of people able to download the training material.

Are there any good alteatives? Or different ways to implement something like this?

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