IEC/TR 62291:2009(E) specifies an application program interface (API) for reading and writing the files which conform to the Universal Disk Format (UDF) ® specification revision 2.00 developed by the Optical Storage Technology Association (OSTA) and its security extension. This second edition cancels and replaces the first edition, published in 2002, and constitutes a technical revision. The significant changes with respect to the first edition are the following:
- reference document ISO/IEC 9945-1:1990 is replaced with ISO/IEC 9945-2:2003,
- reference document UDF 2.00 is replaced with UDF 2.01.