EULA

In order to use pretty much any piece of software, the manufacturer requires you to accept the terms of these giant legal documents called End User License Agreements, or EULAs for short. While they can sometimes make for interesting reading (did you know that you're not allowed to use Windows to run a nuclear reactor?), there's generally nothing you really need to know in any of these. For all we know, you're agreeing to give Adobe your first-born child in order to use Photoshop. Just click Accept and enjoy your software.