Now, this is interesting. A French court has ordered Sony France to clearly state on the packaging of its digital music players the limitations that are caused by the proprietary DRMs of Sony and their competitors - restrictions that limit where an owner of a Sony digital music device can obtain DRMed music (ie any major label releases).
French judges say that the limitations that exist on Sony's digital walkmans, which in some ways force users to buy music from Sony's own Connect download store, breach the country's rules against "linked sales". That said, the judges admitted that current French laws do not prohibit Sony from using DRMs (you'll remember that attempts to alter French law so that owners of proprietary DRMs were forced to share their technology with their rivals were unsuccessful). To that end the courts decided that they couldn't stop the limiting DRM practice, but they could force digital music player manufacturers to alert consumers to the limitations, on the company's packaging and website.
Sony say they haven't decided as yet whether to appeal the decision, but they don't plan to add any restriction warnings to their packaging until the legal process is completed. But it's the precedent that is really interesting here. Que Choisir, the consumer association which launched the case against Sony back in 2005, have launched similar action against the kings of restrictive DRM, Apple. With the iPod maker already facing a similar lawsuit in the US, in that case launched by an individual consumer, it will be interesting to see how Apple's anti-interoperability business model stands up when it faces court analysis on both sides of the Atlantic.