I've recently been exposed to VitalSource as a course I'm taking has its primary textbook only available from VitalSource. In any case, I've found Bookshelf to be quite annoying and slow, so I took out some time to figure out the format.vbk Format The.vbk format is, at its core, a container format. It contains all the components of the book, laid out as files in the container. It's sort of like the type of large resource packs you see in games these days. The file is read from the end: there is a 'magic number' that identifies the file as in.vbk format, the size of the header, and the header itself. The header is an XML string that contains basic information about the file, such as version, built date, file table info, sanity info, and some metadata. The rest of the data are file data as laid out by the filemap.
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There are currently four distinct categories of book formats that can be contained by the.vbk file. They are vitalbook, epubbook, picturebook, and pdfbook. VitalBook The vitalbook format (aka DashML) is basically an XML document, stored with VitalSource's proprietary serialization format. The document has a custom XML schema. Images and videos are stored as file entries in the.vbk container. Patent for the serialization format can be found.
Also of interest is, which includes an old copy of the DTD for the XML, starting on page 35. Last known DTD version is 3.2. EPUBBook The epubbook format is just the contents of an EPUB file put inside a.vbk container, along with search indexing data. The files can be extracted and packed to a Zip file for a valid EPUB book. PictureBook The picturebook format contains images of each page of a book.
Alongside those images are a manifest, text contents of each page, metadata file for position of glyphs (for text selection), linebreaks, and links, and index files. This format may be harder to convert to e-book reader formats, considering they're just images. Probably the best format to convert to is PDF. PDFBook The pdfbook format is basically the same as picturebook, except instead of images of pages, there is a single PDF of the book. The text content and page metadata files are still generated and included (for whatever reason).
The PDF appears to be the same file as is submitted by the publisher. DRM The DRM used in this system is pretty straightforward. The individual streams inside the.vbk are encrypted with AES-256 CBC as necessary (i.e. Everything except for cover and cover thumbnail). The keys for the files are stored in a license file (oddly, also a.vbk; its password is encrypted with RSA-2048 OAEP and the encrypted password stored in the.vbk's header).
The license file is delivered from VitalSource's server, and contains basic account information (name, email, device ID) and book information (password, print and copy limits, expiration date). The patent for the DRM system can be seen. (Interesting to note, the system in practice deviates slightly from the patent by using a single, static RSA keypair instead of a unique keypair for each user.) While it appears no.vbk is distributed without encryption, it is entirely possible to read one that is not encrypted (I tried it on Bookshelf; although it'll prevent you from opening the file if it doesn't find its ID (derived from file name.) in the license file, a rename did allow the decrypted book to work just fine). Next steps What I'd like is to get VitalBook support in calibre. I've made a utility to decrypt, extract, and convert.vbk files (convert meaning vitalbook to XML, not other types to other formats, though I do have an epubbook to EPUB converter). Unfortunately, it's all written in C#, and I don't know Python, so I can't write a plugin for calibre. Would anyone be interested in bringing support for it to calibre?
I'm thinking most basically extracting epubbooks and PDFs for import, and getting metadata from the.vbk header. (Although the metadata doesn't contain publisher name, publication date, or category info.) Existing converters Although there are no 'offline' converters publicly available right now, there are still ways to convert certain VitalBook variants into other formats.
PDFBook: Use the to dump the embedded PDF file. EPUBBook: Use to convert to EPUB. VitalBook and PictureBook: Use a PDF printer to convert to PDF. Note this may be slow, and the resulting pages will include a watermark header and the page quality may be lower. In the U.S., it is legally dubious thanks to the DMCA. It is legal to create it, and it is legal to possess it, but it may or may not be legal to distribute it (as I understand it, hinging in large part on whether you can convince people that such a book constitutes a 'computer program', making it qualify for a fairly significant loophole). What you could do, though, is document how the format works, but leave out the de-DRM portions, and let somebody else outside the U.S.
Re-reverse-engineer the remaining bits.
To download CONVERT VBK FILES TO PDF, click on the Download button I've emailed Apprentice Alf about the conversion tool before, but I never got a response. Would anyone be interested in bringing support for it to calibre? The rest of the data are file data as laid out by the filemap. I actually already made a program to pf EPUBBook and PDFBook, and to convert PictureBook into PDF.
What you could do, though, is document how the format works, but leave out the de-DRM portions, convert vbk files to pdf let somebody else outside the U. Convert vbk files to pdf Convert vbk files to pdf Convert vbk files to pdf VitalBook The vitalbook format aka DashML is basically an XML document, stored with VitalSource's proprietary serialization format. Alternatively, use one of the free PDF creation programs, such as doPDF or CutePDF, which also install a convert vbk files to pdf PDF printer to the computer. Also of interest iswhich includes an old copy of the DTD for the XML, starting on page 35.
If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Download the convert vbk files to pdf application onto the computer, double-click the installation file and follow the on-screen instructions to install the application onto the computer.
The keys for the files are stored in a license file oddly, also a. Convert vbk files to pdf If you're using Windows, I actually have a DLL you can use to the PDF. I intend to release them after some cleanup, but they're going to be pretty useless without the decryption convert vbk files to pdf which I can't include due to forum rules on DRM. I've done easy stuff but never tried to break DRM convert vbk files to pdf of a book before. Please if you have any questions or concerns. Images and videos are stored as file entries in the.
This format may be harder to convert to e-book reader formats, considering they're just images. Convert vbk files to pdf The header is an XML string covert contains basic information about the file, as version, built date, file table info, sanity info, and some metadata. Though the e-book program does not provide an conversion converf, you can convert the VBK file to a Portable Document Format PDF file by first installing a PDF print driver. What you could do, though, is document how the convert vbk files to pdf works, but leave out the de-DRM portions, and let somebody else outside the U. It really is an annoying format. Step 1 Open a Web browser and go to a website that offers a print-to-PDF application for download.
File extension.txt Category Description The.txt file extension is one of the most ubiquitous file types. The file generally consists of plain text only and contains no formatting. Almost any application that can handle text can open a.txt file. As a result this format remains popular due to its support across all platforms and Operating Systems. The file type is one of the oldest file types in existence with its origins tracing back to the first computers. Actions Technical Details A.txt file normally uses a basic character set which contains letters, numbers and symbols.
A typical example of this would be the ASCII character set. The main alternative to ASCII is Unicode. Unicode is a rival format for text files. A plain text file should only contain several non-printable charaters such as new lines, tab and form feed. Associated programs Notepad TextEdit WordPad Developed by Various MIME type text/plain application/txt browser/internal text/anytext widetext/plain widetext/paragraph Useful links.
Convert Vbk File To Pdf
File extension.pdf Category Description PDF is a file format developed by Adobe Systems for representing documents in a manner that is separate from the original operating system, application or hardware from where it was originally created. A PDF file can be any length, contain any number of fonts and images and is designed to enable the creation and transfer of printer-ready output. Actions Technical Details Each PDF file encapsulates a complete description of a 2D document (and, with the advent of Acrobat 3D, embedded 3D documents) that includes the text, fonts, images and 2D vector graphics that compose the document.
They do not encode information that is specific to the application software, hardware, or operating system used to create or view the document. Associated programs Adobe Viewer Ghostscript Ghostview Xpdf gPDF Developed by Adobe Systems MIME type application/pdf Useful links.
File Format Information:. EPUB (Electronic Publication) is a free and open e-book standard from the International Digital Publishing Forum (IDPF), an open XML-based format for digital books and publications, can be read on portable e-ink devices, mobile phones, and desktop computers. PDF (Portable Document Format) is a formatting language developed by Adobe, an extensible page-description protocol that implements the native file format based on PostScript language, uses standard compression algorithm, documents can contain text, graphics, multimedia, custom data types and more.
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