Pro gives you 6 months of upgrades (no refunds), as it says on the download page . After that, you need to renew (I'm on my 3rd).

If you MUST have a legal opinion, you need a lawyer who knows the laws of your country, because the laws are changing.

You've already had some sensible opinions, but if you need more, search these forums for "legal" and follow the links.

Cheers