Royalty payment class actions: Opt-in? Opt-out? How does it affect me?

In recent years multiple class action lawsuits have been filed against the biggest textbook publishers, challenging their royalty-payment practices. In 2016, it was a suit against Pearson, alleging (among other things) gray market sales to international subsidiaries, paying lower international royalty rates, and then shipping books back into the U.S. for retail sales.1 More recently, there have been suits against Cengage, challenging “Cengage Unlimited,” Cengage’s all-access, Netflix-like subscription model.2 McGraw-Hill was also sued, in January, for improper royalty payment practices on its “Connect” products.3