A developer published a Chrome extension called Downloadify designed to let people download MP3 copies of the songs they stream over Spotify’s Web-based player. Downloadify description on Chrome Web Store stated
“Simple Chrome Extension to Download all Spotify Songs,”
The extension quickly disappeared from the Chrome Web Store as this violates their Google Chrome Web Store developer agreement.
“Those writing Chrome extensions agree that they will not engage in any activity with the Web Store, including the development or publication of Products or other materials, that infringes on the intellectual property rights of others [or] enables the unauthorized download of streaming content or media.”
Spotify is looking into the issue of how this happened as they do not want to risk any backlash from licensing agreements with major music labels.