edit: Here's an example,
- "In so doing, the magistrate judge agreed with plaintiffs’ assertion that the solution manuals sold by defendant qualified as “derivative works” under the Copyright Act. As in Pavlica v. Behr and Addison-Wesley Publ’g Co. v. Brown, defendant’s manuals complemented plaintiffs’ 187 copyrighted textbooks, had no “independent economic value” and were “meaningless’ without the textbooks because they merely provided answers to questions posed in the textbooks."
https://www.law.com/newyorklawjournal/almID/1202435027834/ (2009)
https://www.courtlistener.com/docket/4345754/pearson-educati... (the ruling is available here, gratis)
