Samsung has added Apple's latest handset to a US patent lawsuit claiming the iPhone 5 infringes eight of its technologies.
The disputed innovations include a way to synchronise photos, music and video files across several devices, and a method to capture and send video over the internet.
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HTC, Motorola, Microsoft, RIM and other tech firms are also involved in ongoing US lawsuits.
Legal experts have expressed concern at some of the tactics being used, including Judge Richard Posner who threw out a case involving Motorola and Apple in June, rebuking both firms.
He has now followed this up with a blog post in which he calls for an overhaul of the law regarding software patents.
"Nowadays most software innovation is incremental, created by teams of software engineers at modest cost, and also ephemeral - most software innovations are quickly superseded," he wrote.
"Software innovation tends to be piecemeal - not entire devices, but components, so that a software device (a cellphone, a tablet, a laptop, etc) may have tens of thousands of separate components (bits of software code or bits of hardware), each one arguably patentable.
HTC, Motorola, Microsoft, RIM and other tech firms are also involved in ongoing US lawsuits.
Legal experts have expressed concern at some of the tactics being used, including Judge Richard Posner who threw out a case involving Motorola and Apple in June, rebuking both firms.
He has now followed this up with a blog post in which he calls for an overhaul of the law regarding software patents.
"Nowadays most software innovation is incremental, created by teams of software engineers at modest cost, and also ephemeral - most software innovations are quickly superseded," he wrote.
"Software innovation tends to be piecemeal - not entire devices, but components, so that a software device (a cellphone, a tablet, a laptop, etc) may have tens of thousands of separate components (bits of software code or bits of hardware), each one arguably patentable.
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