Any time you get mad about a streaming service who seems to have changed music or a credits clip for a TV show or movie, this is basically why.

To get the rights to use things in technologies that didn't exist when the media was created, you often have to go back to everyone involved and get their permission. Sometimes they don't say yes, or they aren't findable, or just aren't alive, and it's not clear who owns the rights anymore.

This isn't as much of a problem with newer media, because contracts now specify what happens with new technologies, but old contracts were often limited to specific technologies.