In a widely cited article Boyle suggests that a movement against the growing propertization of knowledge should develop a mobilization frame centered around the idea of the public domain. Based on an analysis of the framing strategies in the two most important protest mobilizations against extensive intellectual property rights I discuss whether and to which degree these movements did actually put the concept of the public domain at the center of their argumentation. The article uses political claims analysis and discourse (...) analysis to show that the actual framing strategies relied on other frames. It closes with a discussion, explaining why the idea of the public domain is essentially a defensive concept with a limited potential for movements that primarily address the production of knowledge. (shrink)