ACM opens another hole in the paywall

ACM opens another hole in the paywall
Unlike some newspapers, which are suffering badly in the Internet age, major nonprofit scholarly publishers such as the ACM are in good financial health, with a diverse array of activities and revenue sources: membership dues, conferences, refereed journals, magazines, paid job-advertisement web sites, and so on. Still, there is a lot of experimentation about how to survive as a publisher in the 21st century, and this appears to be the latest experiment.