noatime

Hi to evryone , I'll like to ask you , if somebody wants to try to build a game ( e.g. a graphical or textual videogame ) , how can be sure to don't infringe any other license ? Is there a solid line to look at ? For examle if the game's character will be too close at the look of some already existing hero , or the story seems like a promoted book , or film ... How can I be aware of ? Any...