marat asks: "This Thursday our HMV store had (what I thought was) some kind of sale of well-know DVD titles starting from $5 a piece, however after I brought about $200 of them home I discovered that Kaffeine (xine frontend) refuses to play them. Closer inspection revealed small 'Please use with DVD video player' notice on each cover. More elaborate piece of paper enclosed -inside- stated that I have to download and install something called 'InterActual Player' if I want to watch this disk on the PC or Mac. The disks have the 'DVD video' symbol on them, and I don't have any other DVD player nor TV set at home, nor place to put it. Besides, I prefer my 19" monitor anyways. I didn't find the solution myself, that's why I'm asking the Slashdot crowd two questions: How can I play this stuff under Linux? What should I do if they refuse to accept opened cases back? (for semi-legal advice, please take into account that I'm in Tokyo).""I've also learned that:"