I have found an extremely easy way to achieve Minecraft for free without any crack or torrents at all.

1. Download Demo Minecraft

2. Download Magic Launcher ( Basically a 3rd party launcher for Minecraft)

(Source http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-tools/1262884-launcher-magic-launcher-1-3-1-mods-options)

3. Install any single demo version from the official Minecraft launcher)

4. After installation launch that demo client you installed on the official Minecraft, IN the Magic Launcher

5. Boom, The Minecraft demo for some reason turns into an official copy, an offline copy of course.

In return, give me a damn Minecraft copy