A key anti-piracy addition to YouTube's software that the video-sharing site promised to introduce by the end of 2006 still isn't available, and that could ruffle the feathers of many in the music and entertainment industry, the Financial Times reports.

YouTube in September promised software upgrades that would add a "content identification system," technology meant to make it possible to track down copyrighted music or video on the site. The company claims that testing of the software is ongoing and is "on track."

But a delay of the software upgrade beyond the first few weeks of 2007 would suggest a longer-term wait - and that could be a deterrent to any content deals that Google may be hoping to strike for YouTube.

Since its purchase by Google in late 2006, YouTube has been working with the music and entertainment industries to forge content deals; those, however, hinge on YouTube's ability to quickly track down and remove copyrighted material.