Actually I'm not asking how to sell a game. I know it. My question is about how these games are delivered... Well, not actually. I know how to deliver them, but there are some new concepts and markets that I don't understand.

For example, what is "Pay for play" (or Pay4play, as I've read)? I've bought Minecraft, which is pay4play, but I don't understand it. Ok, if I don't pay I can't play multiplayer mode and it doesn't updates automatically. Is that all? All games that are Pay4play are the same? Isn't Pay4play another way to say shareware?

Another concept is "DRM free". I know what DRM is (I think ), but I don't get that concept. I see that some Steam games are DRM free, but do you need to connect to Steam to play them as in any other Steam game? If you need to then it isn't DRM free actually, is it?

And talking about Steam: Last time I used Steam was about 3 or 4 years ago, and it was painful. People said me that it changed a lot in last years but I'm not sure. I remember that it starts-up with the OS and it steals a lot of resources (memory and CPU) and it isn't possible to halt it, not even to uninstall it (I had to format and re-install Windows to remove it). How does it work now?

Google's Play Store is much the same dog* but this time the culprit are the software-makers themselves (not all them, fortunately) adding buttons in the appropriate places to be clicked.

And I've read that Microsoft has it's own store and that anything that isn't acquired through this store are treated as malware by Windows 8. Is that true.

About Apple store, the same.

I think I'm forgetting something but I can't remember it... Anyway there are a lot of questions yet. I hope somebody can help me (and anybody else) to understand this mess.
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* Spanish proverb: "It is the same dog with different collar."