May 4th has been designated as the International Day Against DRM for 2011. DRM or Digital Rights Management, is the software that prevents copying of ebooks. It also prevents consumers from reading legitimately purchased ebooks on any device of their choosing.
If you are interested in getting involved, you can sign up for the 2011 Day Against DRM Mailing list. There is also a 2011 Wiki page where you can learn more and take part in making plans for the day.