The problem here is actually trademark law not copyright. The idea behind trademarks is that customers know the source of the product, so names, logos, brands,

The problem here is actually trademark law not copyright. The idea behind trademarks is that customers know the source of the product, so names, logos, brands, etc. are protected by it. Copyright only protects the actual content/expression of the work of the Choose Your Own Adventure, not the name of the series. Stallman has a nice article about the conflation of the "intellectual property" laws here: https://www.gnu.org/philosophy/not-ipr.html https://www.gnu.org/philosophy/not-ipr.html