DATA RECORDING MEDIUM, AN INFORMATION REPRODUCING DEVICE AND A METHOD, AND A COMPUTER PROGRAM, PARTICULARLY IN RELATION TO AN INFORMATION RECORDING MEDIUM SUCH AS DVD, AN INFORMATION REPRODUCING DEVICE AND METHOD SUCH AS DVD PLAYER, AND A COMPUTER FUNCTIONING AS THE INFORMATION REPRODUCING DEVICE

摘要

PURPOSE: A data recording medium, an information reproducing device and a method, and a computer program are provided to effectively prevent a picture quality from deteriorating in a sub-picture such as a subtitle according to supplementary video information, while down-converting HD-standard main video information into SD-standard main video information. CONSTITUTION: Main video information(HDV) based on the first standard of the first sharpness is recorded on an information recording medium(100) to reproduce/display a main video picture with the first sharpness. The first supplementary video information(HDSP) is based on the first standard to reproduce a sub-picture with the first sharpness while the sub-picture is synthesized with the main video picture. The second supplementary video information(SDSP) is based on the second standard of the second sharpness, which is lower than the first standard, to reproduce the sub-picture with the second sharpness while the sub-picture is synthesized with the main video picture.