Cengage Unlimited, that gives students at U.S. higher education institutions access to all of the company’s digital higher education materials for $119.99 a semester has Cengage authors concerned about how their contracts will be affected.

“I think the authors should find out as soon as possible how we are going to be paid,” said mathematics author Pat McKeague, who did not receive any information from his publisher about the new service prior to its public announcement, and has not been able to reach his editor for more information. “My contracts require my written permission before any electronic version of my book can be published.”