Is "some jurisdictions" such as Italy the entire world? Is the seller based in one of these countries? Is the forum hosted in one of those countries? Are customers from those countries even trading with him? No? You don't know? In that case NOTHING HE IS DOING IS AGAINST THE FORUM RULES.
I have no idea about the legal situation, however I would like to remind OP that Microsoft is the largest company to accept Bitcoin for some of their products and you are not doing them a favour by selling MSDN. I care a lot less about him violating the ToS of companies that are unwilling to do Bitcoin stuff.
Are you really crying a sob story for Microsoft? REALLY? If you think Microsoft gives two shits about you or Bitcoin, beyond profit motive, you are sorely mistaken.
Oh my GOD, another thread about the trust system. This is really insane, I don't think Vod has abused the trust system but his negative trust is not necessary because legality and illegality is an abstract concept here in the forum. We do not know in which jurisdiction is based the seller and ours are only supposition.
However OP you should try to talk with Vod, only he can remove the negative trust and if he abused it then he will be removed from the trust system as few other users.
Good luck with your battle (that was only my personal opinion, and we are in a free forum with right & clear rules).
Yes, yes, it is always insane, of course until it is you personally who have to deal with it. Then it is a travesty that must be corrected. It is way to easy to dismiss people from the sidelines when it has zero direct effect on you. BTW, the rules aren't so clear, especially relating to the trust system. In fact there are no official rules posted anywhere on the forum. This makes it much easier for those in charge to say "do as I say, not as I do", but then unfortunately leaves the rest of the forum guessing as to what is ok and looking to bad examples like VOD for an answer to what is acceptable behavior.