Two major labels acquiesce on DRM and agree to license tracks to online retailer’s download store.

In a move that could serve as a death knell for DRM (digital rights management) as the defining feature of digital music’s first decade, all four major labels have signed on to Amazon’s MP3 download store.

Sony BMG Music Entertainment is finalizing plans to sell songs through Amazon without the copyright protection software that has long restricted the use of music downloaded from the Internet, BusinessWeek.com reported today. That news comes on the heels of Warner Music Group’s decision late last month to join the Amazon store, a stark departure from the company’s stated allegiance to using DRM to prevent piracy.

Full article: mp3.com