Want to know why, if you are under 18 years of age, you are unable to download some content off of the Xbox Live Marketplace? Well as you would have thought, it's to do with the ESRB, as Major Nelson explains.

The answer lies with video game ratings organizations, like the Entertainment Software Rating Board (ESRB). Game demos and trailers distributed over Xbox Live are considered advertising and in accordance with the ESRB’s Principles and Guidelines for Responsible Advertising Practices Xbox Live members under 18 do not have access to demos or trailers for a title rated M (Mature) or RP (Rating Pending.) ESRB Guidelines are industry wide and are not unique to Xbox Live.