Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. User-controlled content is associated with portions of an electronic book. A study guide corresponding to at least some of the portions with associated user-controlled content is generated. The user can navigate between portions of the study guide and the corresponding portions of the electronic book.

Abstract: A client (e.g., an eReader) includes a reader application module for presenting content to a user of the client. The reader application module displays an interface including a plurality of pages of a digital content to a user of a client. The reader application module identifies a point of interest included in a page of the plurality of pages of the digital content and assigns a physics model to the identified point of interest. The physics model may be selected from a plurality of physics models based on a type of the point of interest. The reader application module receiving an interaction from the user wanting to skim through the plurality of pages of the digital content and applies the physics model responsive to receiving the interaction from the user.

Abstract: The functionality of an ereader module that is displaying an electronic book (“ebook”) is extended. A user identifier specifying a user using a client device executing the ereader module and an ebook identifier specifying the ebook displayed by the ereader module are received from the client device. One or more layers associated with the user are determined. One or more layers associated with the ebook are determined. A list of one or more layers is assembled. The layer list is transmitted to the client device. The client device enables the user to select a layer and use the selected layer to interact with content of the ebook.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer. Motion of the electronic book reader below a threshold speed causes a change in display of user-selected content in a first manner and motion above the threshold speed causes a change of display in a second manner.

Abstract: A client (e.g., an eReader) includes a reader application module for presenting content to a user of the client. The reader application module displays an interface including a plurality of pages of a digital content to a user of a client. The reader application module identifies a point of interest included in a page of the plurality of pages of the digital content and assigns a physics model to the identified point of interest. The physics model may be selected from a plurality of physics models based on a type of the point of interest. The reader application module receiving an interaction from the user wanting to skim through the plurality of pages of the digital content and applies the physics model responsive to receiving the interaction from the user.

Abstract: A client (e.g., an eReader) receives and displays a sample version of an e-book or other content to a user retrieved from a store server. The sample version is a subset of the full version of the content. The client establishes a location in the sample content as a purchase point. The location of the purchase point may be determined by a content server, the client, or another entity. If the user consumes the content past the purchase point, the client treats the user's action as the user's intent to purchase the full version of the content. The client automatically performs a purchase transaction for the full version of the content, and prepares the full version for consumption by the user. The client seamlessly transitions the user to the full version.

Abstract: The functionality of an ereader module that is displaying an electronic book (“ebook”) is extended. A user identifier specifying a user using a client device executing the ereader module and an ebook identifier specifying the ebook displayed by the ereader module are received from the client device. One or more layers associated with the user are determined. One or more layers associated with the ebook are determined. A list of one or more layers is assembled. The layer list is transmitted to the client device. The client device enables the user to select a layer and use the selected layer to interact with content of the ebook.

Abstract: The functionality of an ereader module that is displaying an electronic book (“ebook”) is extended. A user identifier specifying a user using a client device executing the ereader module and an ebook identifier specifying the ebook displayed by the ereader module are received from the client device. One or more layers associated with the user are determined. One or more layers associated with the ebook are determined. A list of one or more layers is assembled. The layer list is transmitted to the client device. The client device enables the user to select a layer and use the selected layer to interact with content of the ebook.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. A finger press on a touch screen produces a contextual menu with user choices that relate to where the finger was pressed or what the user was recently doing with the book. A student provisionally navigates through a book by a specific gesture which, when it stops, returns the user to the previous position in the book. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer.

Abstract: A portion of an electronic book is displayed and a selection of a position within the portion is received. The content of the electronic book is analyzed to determine an amount of whitespace that corresponds to the selected position. In response to the determined amount of whitespace being greater than a threshold amount, a user interface for providing inscription data is displayed. Inscription data is received and stored in association with an indication of the selected position.

Abstract: A system is provided for controlling the transmission of best-effort filed data or programs on channels from one of plural controllers to one or more client nodes. A program is a group of files and has program information indicating to a client node how to use the files of the program. A channel is a virtual path, wherein a client node can receive program files from different channels in a separable fashion. Channels also have channel information. Multiple controllers are provided which self configure in rank order to control the scheduled transmission of programs files on channels. Client nodes receive announcements of programs and channels from the controllers and selectively subscribe to the channels and programs. Client nodes can be instructed to positively acknowledge receipt of programs and also send back negative acknowledgements for ranges of data words in program files not received. The negative acknowledgements can be consolidated to reduce the number of packets on the network.

Abstract: A portion of an electronic book is displayed and a selection of a position within the portion is received. The content of the electronic book is analyzed to determine an amount of whitespace that corresponds to the selected position. In response to the determined amount of whitespace being greater than a threshold amount, a user interface for providing inscription data is displayed. Inscription data is received and stored in association with an indication of the selected position.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. A finger press on a touch screen produces a contextual menu with user choices that relate to where the finger was pressed or what the user was recently doing with the book. A student provisionally navigates through a book by a specific gesture which, when it stops, returns the user to the previous position in the book. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer. Motion of the electronic book reader below a threshold speed causes a change in display of user-selected content in a first manner and motion above the threshold speed causes a change of display in a second manner.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. User-controlled content is associated with portions of an electronic book. A study guide corresponding to at least some of the portions with associated user-controlled content is generated. The user can navigate between portions of the study guide and the corresponding portions of the electronic book.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. A finger press on a touch screen produces a contextual menu with user choices that relate to where the finger was pressed or what the user was recently doing with the book. A student provisionally navigates through a book by a specific gesture which, when it stops, returns the user to the previous position in the book. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer.

Abstract: An electronic book system provides interfaces particularly suited to students' use of textbooks. A finger press on a touch screen produces a contextual menu with user choices that relate to where the finger was pressed or what the user was recently doing with the book. A student provisionally navigates through a book by a specific gesture which, when it stops, returns the user to the previous position in the book. Annotations are displayed and hidden using specific gestures and through selective movement of the reader as sensed by its accelerometer.