Universal Disk Format (UDF) filesystem
The Universal Disk Format (UDF) filesystem provides access to recordable media, such as CD, CD-R, CD-RW, and DVD. It's used for DVD video, but can also be used for backups to CD, and so on. For more information, see http://osta.org/specs/index.htm .
The UDF filesystem is supported by the fs-udf.so shared object.