The press release has quotes from both Microsoft and Rakuten reps:

"Our agreement with Rakuten reinforces the opportunities that cross-licensing can bring to companies across the technology spectrum," said Nick Psyhogeos, president of Microsoft Technology Licensing. "We're pleased to have found a mutually beneficial path of collaboration that will ultimately benefit consumers."

"This agreement gives us the freedom to bring our customers new and exciting products, while jointly recognizing the value of patented innovation," said Akio Sugihara, managing executive officer and director of Rakuten."