What you write is true. However, in my opinion, there is even a better reason to prefer patent-unemcumbered formats: the risk to not be able to play your files in the future using free software. Indeed, patent holders can sue the developers of the free software and force them to stop distributing their codecs. The patents do not even need to be valid: the cost of patent litigations are so high that even companies cannot afford to pay them and informally settle the issue paying a "tax" to the patent holder. In the end, software patent holders are like mafias ("if you do not pay us, your house may burn").

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