See the video for the gory details.
The tl;dr version is that libraries are trying to get exemptions from copyright law to allow them to bypass DRM on old games in order to preserve the games. The Library of Congress has given them a partial ok - libraries can do this but can't enlist volunteers to help. That essentially means it won't get done because libraries don't typically have the people to do what is necessary.
In three years this will be revisited. If you care about what happens to old games when the DRM servers go dark, you might want to be aware of what's going on.