Abstract: A multimedia data recording apparatus, a multimedia data reproducing apparatus, and multimedia data storage include a first layer storing multimedia data; and a second layer in which, when the multimedia data is divided into a record unit and a reproduction unit, information of attributes of the record unit and a relationship between the record unit and the reproduction unit are described with a markup language using elements and the attributes. Navigation data, which is used to control a selection of the reproduction unit and reproduction sequence, is recorded on a third layer.

Abstract: An apparatus reproduces AV data in an interactive mode, a method handles a user input, and an information storage medium stores information therefor. The information storage medium includes AV data and a markup document utilized to reproduce the AV data in an interactive mode. The markup document includes first event information of an occurrence of a key input event corresponding to a user action to inform, by default, an AV playback engine, which plays back the AV data. Accordingly, interactive contents may be controlled using a limited user input device.

Abstract: An apparatus reproduces AV data in an interactive mode, a method handles a user input, and an information storage medium stores information therefor. The information storage medium includes AV data and a markup document utilized to reproduce the AV data in an interactive mode. The markup document includes first event information of an occurrence of a key input event corresponding to a user action to inform, by default, an AV playback engine, which plays back the AV data. Accordingly, interactive contents may be controlled using a limited user input device.

Abstract: A method and apparatus to focus on input items in an object picture embedded in a markup picture. An object interpretation engine for the object picture transmits a message for moving a focus to a markup interpretation engine for the markup picture in response to a key of a user input device pressed to move the focus. The markup interpretation engine focuses on one of the input items according to a predetermined order in response to the message.

Abstract: An information storage medium on which video data are recorded, includes: a plurality of clips that are recording units in which the video data are stored; and text data for subtitles which are recorded separately from the plurality of clips and overlappable with an image according to the video data and then outputtable, the text data including data for providing subtitles in at least one language.

Abstract: An information storage medium controls a multi-angle data reproducing apparatus by having a data structure including at least one clip for each angle, each angle clip being a data record unit of the multi-angle data for an angle. Each angle clip is divided into predetermined jumping units at jumping points and each is recorded in contiguous areas of the information storage medium. Using the clip jumping points as a link among the angle clips in which each angle clip is contiguously recorded provides efficient random access for reading the multi-angle data for angle change.

Abstract: A network accessible apparatus and security method thereof, include identifying whether a command is a reliable request or an unreliable request, wherein a context issues the command to read a content; reading the content and generating a reliable context corresponding to the content when the command is the reliable request; and reading the content and generating an unreliable context corresponding to the content when the command is the unreliable request.

Abstract: A method of verifying the defect management area (DMA) information of a recordable and reproducible optical disc, and a test apparatus for performing the same. The method of verifying the DMA information includes selecting one among a plurality of test modes for verifying DMA information, setting a test reference according to the selected mode, generating test information from the DMA information, which is generated or updated by a recording and reproducing apparatus to be tested, according to the verification test mode, and executing the test for verifying the test information using the test reference in the selected mode. Accordingly, it is easily verified that a recording and reproducing apparatus properly translates and processes defect information, by using a different test disc, which is made using a mirror file with pre-fixed defect information which is not related to actual defects on a disc, depending on the DMA information verification test modes.

Abstract: Provided are a method to display a mark-up document according to a parental level, a method and an apparatus for reproducing AV data in an interactive mode, and a data storage medium. The data storage medium includes the AV data, and mark-up documents to reproduce the AV data in an interactive mode. Here, among the mark-up documents, a start-up document contains information on the mark-up documents to be displayed according to a set parental level.

Abstract: A recording medium includes a program containing video data and/or audio data and navigation information which defines a thumbnail, wherein the thumbnail relates to the program and is reproduceable as moving pictures. The recording medium may include a plurality of programs and the thumbnail may identify or represent one or more of the programs. By assigning a predetermined interval of a bit stream corresponding to a program as a thumbnail, the recording medium having the thumbnail thereon, that can be reproduced as moving pictures, can be obtained.

Abstract: A method of and an apparatus for reproducing data from the information storage medium, which supports an interactive mode, includes caching at least part of search information necessary to access mark-up language documents in a memory, and reading the mark-up language documents by referring to the cached search information.

Abstract: A focusing method and a focusing apparatus in an interactive mode, and a data storage medium are provided. The focusing method includes identifying a domain of a resource to which a focused element refers when a command to move a focus between focusing layers is input from a user, and moving the focus by converting the focus-moving command into a command appropriate for the identified domain, when the identified domain is not a mark-up document domain.

Abstract: A disc recording/reproducing apparatus for recording/reproducing multi-channel data simultaneously on a recording medium, the apparatus including channel buffers for recording/reproducing corresponding to the multi-channels, and a recording/reproducing controller for, if there is a channel buffer is filled with data to be recorded among the allocated channel buffers for recording, reading data from the channel buffer to record the data on the allocated continuous space, and if there is an empty channel buffer among the allocated channel buffers for reproducing, writing data read from the recording medium to the empty channel buffer. In the apparatus, the size of the continuous space on the recording medium, the size of the channel buffers for recording, and the size of the channel buffers for reproducing are allocated based on recording/reproducing speed information of a channel in which recording/reproducing is required according to a recording/reproducing request.

Abstract: An information storage medium including a markup document and AV data for use in a reproducing apparatus includes AV data including audio data and video data, a markup document, and scene synthesis information which describes one of at least two display modes for displaying a markup document scene obtained from the markup document and an AV scene obtained from the AV data together.

Abstract: A reproducing method and apparatus for interactive mode using markup documents are provided. The method for reproducing AV data in interactive mode comprises a presentation engine operating according predefined states, where the operating state of a presentation engine for reproducing a markup document is divided into and defined as a start state, a reproduction state, a pause state, and a stop state. In the reproduction state, the presentation engine performs a loading process for interpreting a markup document and loading the markup document on a display screen; an interacting process for facilitating an interaction between the markup document and a user; and a finishing process for finishing the interaction. By the method, when AV data is reproduced in the interactive mode, compatibility of display is provided.

Abstract: A method of and an apparatus for efficiently navigating a plurality of contents which are reproduced in a device for reproducing interactive contents, such as a computer, a DVD player, a PDA, or a cellular phone, by using a device having a limited number of input keys. Focusing layer values are allotted to contents elements to form focusing layers and the contents elements included in any one focusing layer are provided to a user. The focusing is moved when a command to move the focusing is input from the user. Accordingly, any kind of media storing interactive contents formed by using markup language is navigable using the device having the limited number of input keys, such as a television remote controller.

Abstract: An information storage medium containing display mode information, and a reproducing apparatus and a method thereof. The information storage medium includes audio/video (AV) data, a markup language document which defines a display window on which an AV screen is output and reproduced based on the AV data in an interactive mode, and mode information indicating a current display mode when the AV screen is displayed in a plurality of modes. With the medium, a user-friendly interface indicates the interactive mode that is not a video mode, even when the current display mode is a full-screen mode that is a subordinate mode of the interactive mode.

Abstract: An information storage medium and a method of and an apparatus for playing the information storage medium include AV data, which includes a video title set containing at least one video object that is constituted of video object units each having an audio pack, a video pack, and a navigation pack, and event occurrence information for generating an event designated based on a data structure of the AV data. Accordingly, a markup document screen can be more easily output in synchronization with an AV screen by utilizing the data structure of an existing DVD-Video without change.

Abstract: A storage medium adaptable to changes in a screen aspect ratio provides various information and audio/video contents that are displayable in a user interactive environment, and includes interactive screen display files that correspond to different screen aspect ratios, respectively. The interactive screen display files are constituted to be adjusted to corresponding screen aspect ratios. Interactive information in the storage medium is constituted to be adjusted to different screen aspect ratios. Thus, interactive information can be displayed without distorting the position and size thereof even when a screen of a predetermined size is changed into another screen of a different size.

Abstract: An interactive optical storage medium, an apparatus for and a method of reproducing data from the interactive optical storage medium. The interactive optical storage medium includes A/V data including audio or video data, and interactive data, which forms an interactive screen and includes a command to preload fonts relating to a content of the interactive screen into a memory of a reproducing apparatus during a seamless reproduction of the AV data. A font to be used is preloaded into the memory of the reproducing apparatus before an AV data screen of A/V data and a content screen of the interactive data, which are simultaneously reproduced in the interactive screen, are changed into a new interactive screen, thereby assuring the seamless reproduction of the A/V data screen.