In 1840 French anarchist Pierre-Joseph Proudhon coined the popular phrase "property is theft". What he actually meant and whether it is true is a debate that continues today, but in the case of intellectual property - of patents, copyrights, and trademarks - things get even more confusing. Can we really own intangible concepts? Or are our thoughts, once communicated, rightfully public domain?
I do not claim to know the answer to these questions, but Tetris Holding LLC and The Tetris Company LLC are pretty sure they do, and recently took a popular casual games portal to court over it.