I think you may be asking a wrong question.
The question isn’t “can you protect yourself from being ID-ed by your closest neighbor”, but “do you mind to transfer such content yourself”.
Technically it’s the same thing, but in the first case you’re the usual guy downloading some TV series, while in the second case you’re serving (in case of a farmer, “storing and serving”) content that may be illegal.
While you won’t download weapon designs and kiddie pr0n yourself, you may serve it. So the second scenario is much worse than the first (should there be a way to ID you).
I find it curious that I mentioned this second risk in other topics, most people dismissed it, but the interest in the first (far less significant) risk is still high.
Who’re are they going to come after first?
@digipl, entrapment is used without any problem. They just tend to use other methods first (aka “entrapment is discouraged”), but if there’s no other way, then they entrap you.
Also they don’t have to do it that way. They can use a version of the Dropbox approach (upload the blocks themselves, and then compare with whatever blocks they see on the network).
One way to get around this would be to use private networks, but then the issue of trust becomes important.
Another way is to change content by random insertion of data, which would increase the cost of sharing unless done on the fly (say, via a Tor Web gateway to SAFE).