ID:1811279
 
(See the best response by Ter13.)
If I install a font and use it in my game will others be able to see it when it's used or will they as-well need to download it?
Best response
You will need to package the font with the game which may or may not be illegal, because fonts are usually jealously licensed.

There are a number of ways to package fonts with your game. If you need the font to show up in the browser in DS, you'll need to generate a EOT version of the font and create a CSS style for it. Font-squirrel will help you do this.

Using an eot format font in IE, for example:

@font-face {font-family:'munro_narrowregular';src:url('munronarrow-webfont.eot');src: url('munronarrow-webfont.eot?#iefix') format('embedded-opentype');font-weight: normal;font-style: normal;}


Unfortunately, for the web client it gets much, much harder. Every individual browser has their own font rules and formats and it's just a complete mess.
When in doubt, use fontsquirrel.com.