So, there's this thing called copyright. It's like a way to protect people's ideas and creations, so that they can't just be copied by anyone. If you make something, like draw a picture or write a book, you can say "this is mine, and no one else can use it without my permission."
But what if you're part of a group, like a club or organization, and you all make things together? It would be kind of hard for each person to individually say "this is mine, and you can't use it" for everything that the group makes. That's where extended collective licensing comes in.
With extended collective licensing, everyone in the group agrees to let their work be used by others, but they get some money in return. It's like a big agreement that says "if you want to use anything that we make, you have to pay us, but it's okay to use it because we all said it's okay."
This can be really helpful for things like music or movies, where lots of people might contribute to a project. Instead of everyone having to individually give permission for their parts to be used, the whole group can agree to let it be used, and they all get a share of the money that's paid to use it.
So, extended collective licensing is a way for groups to work together and protect their creations, while still allowing others to use them and giving everyone a fair share of the money that's made.