Aaron Jones (a cop) literally gave an introduction to his local Linux Usergroup to Freenet explaining what it is and how much he loves it. You can find that on the Freenet Project's website.

You're only going to have a few encrypted chunks of a given file in your datastore, you don't know what the file chunks are when put together or the key used to decrypt it. Information is neutral on Freenet. You would NOT get in trouble just for running a Freenet node in any sane/ free country in the world. If you go out of your way to use Freenet for something illegal, that's another matter entirely.

If you're paranoid, just use a VPN or install it to a VPS and SSH into it.