KKR, an investment firm, completed the acquisition of OverDrive, a digital reading platform for libraries and schools, from Rakuten, a Japanese electronic commerce and online retailing company. Financial terms were not disclosed. "OverDrive is very excited to work with the world-class KKR team due to their track record of accelerating digital media and technology businesses in global markets. This provides access to an extraordinary network of capabilities to empower our institutional partners for the benefit of the communities and readers they serve," Steve Potash, OverDrive Founder and CEO.