Demonoid is a semi-private tracker, and occasionally signups are open, so if you're lucky you could just sign up and not need an invite code. However, most of the time, they are not. To get an invite code, there are two ways. 1. Beg Go to a public site with a forum, approach one of the people who sounds like they know what they're talking about, and ask if anyone has one they could give you. If you ask nicely and spell properly and all that, you're decently likely to get one. 2. Have Proof of your Torrent Prowess This method requires you already be a member of a somewhat respected private tracker and have a decent ratio (or share rank, in the case of Libble.) What you do is go onto the forums of the site you belong to, find a thread offering Demonoid invites, and make a post proudly proclaiming (but still not being a dick) what a good and just and fair user of bittorrent you are, and then point to your stats (ratio; share rank). If you aren't bad, then the person will probably give you one. In either case, be sure to ask nicely, and thank them once they give it to you. If they say no, go ahead and ask why, but don't argue with them.

Hi there, yes I have an account, and would be willing to give you an invitation code, as I don't know of my friends who is really interested in having an account, however, I'm a little concerned about giving away a code without really knowing the person very well, cause if someone I invite gets warned/banned, I might get warned/banned too. So, I would have to know for sure that you wouldn't violate the Demonoid TOS. If you're still interested, write me back. I read FirstAnswer's reply to your question, and I agree. That would probably be the best way for you to convince me that you're not gonna be a leecher the whole time.