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What the library does not provide is DVD ripping and decryption. It reads the structure (e.g. titles and chapters) and generates a special checksum to look up the database.
More details at http://www.dvdetect.de. The database can also be searched using a web browser at http://search.dvdetect.de/.
For those who are curious I suggest downloading the binaries from https://sourceforge.net/projects/libdvdetect/files/binaries/ to try it out (windows only).