I need to spill my guts out!

Another thing to consider;

Most EULA and Licenses state that any legal action taken must occur in a specific country, and be subject to the laws of that country. This makes it irrelevant whether your country allows something or not, if they want to prosecute you for doing so they could. It doesn’t usually happen because re-selling software is a low value target. Mass reselling (a website or store) will get their attention, which is why you don’t see many companies selling used software directly. Some like G2A let users re-sell keys, but the company itself does not because doing so would make them a target for a lawsuit.