It consists of 3 modules: a module editing the book, module reading books and module of the test. There is password protection of every book and the editing mode. With its current functions, you can create quite a good book for easy reading for all students and schoolchildren. There is a print function - this makes the program self-sufficient, as it allows for creation of the book not to use third-party text editors. Since all the books are stored centrally in a database, then it increases the reliability of their safety. Database SQLite3. This allows you to have a database file on any server (Windows, GNU / Linux, etc.), without having to install the database server. The functions of import and export of books allow you to send books to those who have "Klen-library" is not installed, and vice versa - to read other documents in this program. Supported features: - Working with multiple libraries; - Creation of a textbook; - Reading the textbook; - Rich editing the text of the textbook; - Search the text of the book; - Export of textbooks into the file(s): XWB, HTML, TXT, PDF, PostScript, RTF;(*) - Import of textbooks from the file(s): XWB, HTML, TXT;(*) - Print book; - Inserting image; - Working with table; - Protection of books with a password; - Password protection mode editing; - There is a module testing(*); - Adding more information; - Statistics of work; - Backup library; The changes: - Optimized the loading speed of the book up to 10 times; - Fixed inability of normal work with imaging in the book - Added export of books in PDF, PostScript, RTF; - Fixed printing of the book, is now printed in full text; - Added file encryption book format xwb; - Shelk-test module updated to version 1.0.0; - Added ability to check for new versions form the Internet;