Downrate filter?

I was going through my e-mails a few minutes ago and I came across an e-mail from Paul about a downrate filter that was going to be implemented soon. It’s supposed to automatically detect and ban abusive downraters. My question is what exactly this program will consider abusive. I’d hate to see any of the people who actually play fair on this website get abused because they were downrating someone who’s constantly making offensive comments, or something along those lines. Another question. If it so happens that anyone does get banned, are they aloud to come back on sharenator and start posting again after a certain time frame?