BBCApple and Samsung patent row back in court
31 March 2014 Last updated at 09:33 ETThe latest round in a bitter tit-for-tat legal row between the two biggest players in smartphones will be resumed later in California.
Apple has accused Samsung of "systematically" copying distinctive features such as "slide to unlock" from its devices.
But Samsung said it was a "pioneer", and that Apple was doing the copying.
Apple is suing the South Korean firm - which is the market leader - for up to $2bn (£1.2bn).
Apple wants Samsung to be forced to pay a $40 (£24) royalty on every device it deems to be copying its software.
"Apple revolutionised the market in personal computing devices," the company said in court filings.
"Samsung, in contrast, has systematically copied Apple's innovative technology and products, features and designs, and has deluged markets with infringing devices.''
Apple has made copying claims over five features found within its iOS software.
Most recognisable to smartphone users is "slide to unlock" - in which a user slides their finger across the device's screen to unlock it and make it ready for use.
The company has also claimed that Samsung stole tap-from-search technology.
An example of this is when a phone number is being shown - perhaps on a web page or within a text message - and the user is able to tap it to begin a call.
But Samsung has hit back at Apple's claims with two of its own.
"Samsung has been a pioneer in the mobile device business sector since the inception of the mobile device industry," said Samsung lawyers.
"Apple has copied many of Samsung's innovations in its Apple iPhone, iPod, and iPad products.''
Samsung said that it owns a patent relating to how media - pictures and video - are organised on a device.
It also said it invented a method for sending and receiving data using low bandwidth connections.
However, given that this is a case involving disputes over features in software - rather than the hardware of the devices - many have speculated that it is as much about Apple taking on Google, as it is about Samsung.
Google's mobile operating system Android powers the Samsung devices implicated in the case.
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