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.