CD Duplibase is a CD database to find duplicate files. If you have a some unknown files in folder, program will show you files that you already have on CDs. Also you can recover lost filenames. In common, it is disk catalogization tool. But it has one useful function that other disk catalogization tools doesn't have. Let's say that you have a folder with files, downloaded from Internet or somewhere. And if you also have a big number of achives on CDs, you can't say about files in your folder - it's a new files or it's files that you already have on CDs? It resolves this question in two clicks. Just right-click on folder and select "Scan for duplicates". After some time you will see a list of files that you already have on another CDs. After you can delete/move/copy duplicates.