Figures from court documents show that Samsung paid Microsoft around $1 billion (£622 million) in a year to use the Android operating system.
The two companies signed a patent licensing agreement in 2011, with Samsung agreeing to pay Microsoft, although the amount was undisclosed at the time.
Samsung has now stopped paying, claiming that Microsoft’s acquisition of Nokia invalidated the agreement. Microsoft’s response was to take legal action, which has resulted in details of the original agreement becoming public.
The 2011 agreement was due to run for seven years, allowing each party to use technology patents owned by the other.
[Sources: BBC News; FOSS Patents; Microsoft blog]