There are two big problems with that: one problem is that, unless the torrent itself is encrypted, they'll know what they downloaded. After all, they're the ones encrypting it.
The second problem is that judges won't look kindly upon any attempt to blind yourself to what's going on. You'd be a lot better off making a good faith effort to comply with the law, even if you're not perfect at it. Otherwise, people will see it as a wink-and-a-nudge kind of thing, which is exactly what you don't want if you're trying to run a legitimate business.
