Tech blog Gizmodo has been denied press access to Apple’s WWDC keynote address, in the wake of the Gadget website’s purchase of a prototype iPhone that was found in a bar.

In April, Gizmodo paid $5,000 for a lost iPhone 4 prototype and published photographs and analysis of the iPhone prototype to millions of readers.

The tech blog has since reported it was banned from Apple CEO Steve Jobs' keynote speech today at the company's Worldwide Developers Conference in San Francisco. Jobs is expected to unveil the smartphone during his keynote.

Last Friday, the site’s editor-in-chief Brian Lam announced that Apple had ignored the site's request for a pass to WWDC's keynote - the only part of the conference open to the press. At the same time, Lam asked for volunteers to help Gizmodo cover Jobs' speech.

Gawker Media, the company that operates Gizmodo, has admitted it bought the phone after it was left at a Redwood City, California bar by an Apple software engineer.

The iPhone leak drew the ire of Jobs, who spoke about the incident at last week's D8 digital conference.

Get the news from the WWDC 2010 keynote address as it happens from Techworld sister site Macworld UK live feed.