You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract FTC OKs Nielsen-Arbitron Deal, But With Strings Attached PPM Must Remain Available to a Third Party for Eight Years By Jack Neff, Published on December 31, 1969 1 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.