All content that is viewable anywhere on the internet has this risk associated with it. This goes for videos, documents, images, PDFs, etc. Anything a user sees on their screen or hears via their speakers can be captured by their computer. This is true of nearly everything everywhere on the web.
We do however employ encryption security protocols to mitigate this risk as much as possible such as IP blocking, malicious bot detection and rejection, and advanced mass download detection protocols. This makes it so it is very unlikely that people will redistribute the content. Most average people don't know how to capture content.
In the unlikely event that someone does redistribute content, you can easily have it removed from where ever it is being hosted and shared by simply contacting that hosting provider and they will usually remove it right away once you have shown you are the rightful owner.
There will always be a way for people to share content. Friends inviting friends over to watch the videos at one location, people streaming the content in a public setting such as an auditorium, and users capturing the stream with their machines using various software's.
Remember we do our best and monitor for password sharing and abusive usage and have streaming protocols in place to protect from content theft as well.