Refer to the input text as context and select the correct relationship between 'comScore' and 'Rentrak' from the available options.
Options: brand, employer, owner of, platform

Investors and security holders will be able to obtain free copies of the registration statement and the joint proxy statement/prospectus (when they are available) and any other documents filed by comScore and Rentrak with the SEC at the SEC's website at www.sec.gov .
owner of