They're referring to DMCA compliance. Basically, if you're hosting a site where people can post videos, images, text, etc. You have to accept the possibility that someone will try and post every Disney movie in full on there. And you need to have a plan to deal with it, as you'll be receiving a lot of DMCA take down notices from companies that don't want their copyrighted shit on your site.
I suspect you're a little too early in the process to have to consider that, but it's worth thinking about if things start going well.
I suspect you're a little too early in the process to have to consider that, but it's worth thinking about if things start going well.