Spotify has tweaked the music player on its website after someone apparently found a way to harvest every single MP3 file from the audio-streaming service.
Spotify hosts its massive collection of music on Amazon's CloudFront network, but up until Wednesday the streaming biz apparently served them as vanilla unencrypted MP3 downloads for its in-browser player. Thus, Aldenhoven's code was able to take the URL of any track and download the file to his computer, it seems.
Spotify has since altered its systems to break Aldenhoven's exploit, by streaming the music in an encrypted or obfuscated format* using Adobe's RTMP technology. Amazon has more on how to securely stream media from its cloud-backed distribution network here.
"So Spotify made a great HTML5 player for its service, but they forgot their encryption. Nice!" Aldenhoven wrote in his code bundle on GitHub.
But the Rotterdam-based programmer is no freetard. On Twitter, he supported Spotify's obligation to copyright holders.
"Google responded correctly to remove [the extension], but Spotify should not send DRM-free MP3s to users," he tweeted. "Artist can choose to share their music DRM free, but we don't need to force them. Spotify gave them the option to share the music the way artist wanted it, they should not break their commitment."
"I could not believe it myself that [Spotify] did so little to protect their library," he added.
Bloggers branded this episode "Spotify's nightmare realised" - but that's a stretch.
You needed to be a paid-up subscriber to get access to the player, or sign up for free access, and in either case Spotify knows who you are. Technically, you could have infiltrated a subscriber's computer, and swiped the data from that compromised machine, then copied the files somewhere else. It's all risky and laborious, and there are far, far easier ways of filling your boots with free MP3s.
Spotify's "nightmare" would be music companies losing confidence in its business, and declining to renew their music licensing agreements.
The streaming biz offers a legal "download as an MP3" option in some territories, but it's always been very half-hearted about the feature, and the prices have never compared well with dedicated download stores. Which is not surprising, really. It would be like the local spliff merchant offering you lessons in hydroponics. Where's the upside for him in that? ®
* This is based on an initial study of the code and examination of the traffic between a Vulture Central Mac and the Spotify player website over port 1935. If Spotify gets back to us, we'll update this article - sub-editor