When I submit a search, I can also submit the key. Spam filtering can be done as the email streams in. Email databases which power the spam filter can be de-an

When I submit a search, I can also submit the key. Spam filtering can be done as the email streams in. Email databases which power the spam filter can be de-anonymize do and reduced to statistics. I guess sharing is harder but it can still be done. If I share content with you, I'm giving you permission to have a copy so it can be encrypted with your key as well as mine.