We're a new private professional community practice and would like to allow members to share content, if we can find a way. We've got a solid ToS that warns against uploading IP without permission. However, we've already had to remove a few pieces of content that are clearly owned by someone and did not include a Creative Commons License, and we've since stopped allowing content uploads for the time being.
If things are posted on public sites (e.g., YouTube, Vimeo, SlideShare), then one can assume it's fair game, but what about other content?
Is anyone allowing members to either upload or link to other content (specifically, documents)? How are you dealing with it to protect your (and your members') liability?
THX for any wisdom you can share.