There are a myriad of lawsuits currently transpiring and could decide the fate of many digital publishing initiatives. The first is a bloody affair between Barnes and Noble and former Demos Parneros. Audible is also fighting the entire publishing in court for their Captions program, which would add text to audiobooks, similar to how you can watch Youtube videos and view closed captions.
Source: Audible and B&N Lawsuits making waves in the digital publishing wo