Abstract: The present invention provides a method and apparatus for writing an optical disc. By means of storing the control information of the program obtained in one or more optical disc writing processes onto the optical disc or the assigned area of the writing means, converting the control information into control information compliant to a standard after finishing writing and storing control information compliant to a standard onto the optical disc. The present invention builds a friendly interface, overcomes the compatibility of standard and the interface designing problems brought about by the randomness of writing an optical disc, especially the real-time writing.

Abstract: The present invention relates to a method for increasing the extendibility of disk copy protection and a system for the same. The method includes the following steps: a) Compare the version number in the system for disk copy protection with that of corresponding system for the copy protection in the player and confirm whether it needs to revoke data; b) If the data need to be revoked, read the information about the revocation data in said disk, then confirm whether to revoke the partial relevant playing license or revoke all the relevant playing license; c) If partial relevant playing license is to be revoked, undertake revoking confirmation. Using the method for increasing the extendibility of disk copy protection and the system for the same, it is very easy to upgrade the system for disk copy protection and player protection, thereby to prevent piracy effectively.

Abstract: Disclosed is a method of creating video object units (VOBU) in high-definition DVD (HD-DVD) systems. HD enhanced data in the form of data packets are multiplexed and stored with standard-definition (SD) data in a VOBU. In the VOBU, the spa ce where the video pocket (V-PCK) and the for SD data related video packet (V-P CK-HD) for HD-enhanced data are stored is shortened as possible. This will increase the efficiency of a future enhanced DVD video player that supports the HD-DVD optical disc format to fetch, decode and synchronize the SD and HD enhanced data. Furthermore, the optical disc created in this kind of data storing has good backward compatibility.