Rockstar purchased the patents from Nortel in 2011 for $4.5 billion, with Apple tossing in $2.6 billion of that amount. In the process of purchasing the patents, the consortium out bid Google. Besides Apple, the group consists of well-known tech names such as Microsoft, Blackberry, Sony and Ericsson. The suit was filed in Texas last year. Google subsequently filed a countersuit and asked Judge Wilken to rule that it had not infringed on the patents at issue in the Texas filing. Google did this in an attempt to move the case to Northern California. The latter region is seen as more friendly to Google because it has its headquarters there.
Rockstar attempted to get the case moved to Texas by claiming that it had a co-plaintiff called MobileStar, which had an office in Texas. But Judge Wilken wasn't biting, noting that Rockstar had created MobileStar the day before it started suing the seven Android manufacturers. She ruled that MobileStar was not a separate and distinct company from Rockstar.
You can read the entire ruling from the judge, below.
source: Scribd, ArsTechnica via AppleInsider, Reuters