What is the relationship between comScore and Rentrak in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

They may also be obtained for free by contacting comScore Investor Relations by mail at comScore, Inc., 11950 Democracy Drive, Suite 600, Reston, Virginia 20190, Attention: Investor Relations, by telephone at (703) 438-2305, or by going to comScore's Investor Relations page on its corporate web site at www.comscore.com , or by contacting Rentrak Investor Relations by mail at Rentrak Corporation, 7700 N.E.

Answer: owner_of