NBC and YouTube are going from foes to friends.

The network is announcing a deal today that will see select clips of NBC series embedded on the popular viral-video site beginning this week, sources said.

NBC and YouTube declined comment.

The deal is quite a reversal from the well-publicized conflict that broke out between the companies in February, when peacock parent company NBC Universal ordered YouTube to remove hundreds of copyright-violating clips. A skit from "Saturday Night Live" titled "Lazy Sunday" triggered millions of streams for YouTube, becoming its most popular clip for a time.

As part of the deal, NBC will furnish YouTube with promotional clips for a number of its new and returning series, as well as late-night programs like "Tonight Show With Jay Leno." The deal also includes a contest centered on the NBC series "The Office," inviting YouTube users to create their own shortform videos touting the series.

NBC is expected to plug the YouTube alliance on the air and buy advertising on the site. NBC Uni has been active in putting its programming on new-media platforms including NBC.com, Apple's iTunes and peer-to-peer service Wurld Media.

Although the pact represents the first such deal between a broadcaster and a viral-video outlet, YouTube has been striking numerous alliances with other sectors of the entertainment industry, including cable channels E! and MTV2; film companies the Weinstein Co. and Sony Pictures Classics; and record labels like Matador Records.