“Most of the world’s video games from close to 50 years of history are effectively, legally dead. A Video Games History Foundation study found you can’t buy nearly 90% of games from before 2010. Preservationists have been looking for ways to allow people to legally access gaming history, but the U.S. Copyright Office dealt them a heavy blow Friday. Feds declared that you or any researcher has no right to access old games under the Digital Millennium Copyright Act, or DMCA.”
There is a difference there in that these are digital copies (easy to make more copies) vs physical books (hard to make more copies).
That said, the only reason this is an issue is copyright lasts too long on relatively short lived games. If copyright on games was a more reasonable “15 years since their last major revision”, this wouldn’t be a problem.