|This article relies on references to primary sources. (December 2011)|
calibre main interface
|Original author(s)||Kovid Goyal|
|Initial release||October 31, 2006|
|Stable release||0.9.31 (May 17, 2013[±])|
|Operating system||Linux, Mac OS X, Windows|
|Available in||37 languages (fully or partially translated)|
|Type||E-book management utility (utility software)|
|License||GNU GPL v3|
calibre is free and open source e-book computer software that organizes, saves and manages e-books, supporting a variety of formats. It also supports e-book syncing with a variety of popular e-book readers and will, within DRM restrictions, convert e-books between differing formats.
Kovid Goyal started developing libprs500 on 31 October 2006, when the Sony PRS-500 was introduced. The main idea was to enable the use of the PRS-500 on Linux. Goyal, with support from the MobileRead forums, reverse-engineered the proprietary file format LRF.
In 2008, the name was changed to calibre, generally written in lowercase even at the beginning of a sentence.
calibre supports many file formats and reading devices. Most of these e-book formats can be edited, for example, by changing the font or the font size and by adding an auto-generated table of contents. Conversion and editing is only possible after digital rights management restrictions have been removed from commercially purchased e-book files. calibre does not natively support this removal, but the capability can be added to the program by installing freely available plug-ins.
calibre helps to organize the personal e-book library by allowing the user to sort and group e-books by metadata fields. Metadata can be pulled from many different sources (ISBNdb.com, Google Books, Amazon, LibraryThing). Search for author, title or keyword in the whole library, is possible. Full-text search is not yet implemented.
E-books can be imported into the calibre library, either by adding files manually, or by syncing an e-book reading device. On-line content-sources can be harvested and converted to e-books. This conversion is facilitated by so-called "recipes", short programs written in a Python-based domain-specific language. E-books can then be exported to all supported reading devices via USB or via the integrated mail-server. Mailing e-books enables, for example, sending personal documents to the Amazon Kindle family of e-book readers.
The content of the library can be remotely accessed by a web browser, if the hosting computer is running. In this case, pushing harvested content from content sources is supported on a regular interval (subscription).
Development and license 
See also 
- Goyal, Kovid (2013-05-17). "calibre - What's new". Retrieved 2013-05-17.
- "Mobileread Forums". mobileread.com. Retrieved 14 July 2012.
- Sorrel, Charlie. "How To Strip DRM from Kindle E-Books and Others". Wired.com. Retrieved 4 August 2012.
- User named kovidgoyal on fulltext search in TODO list, 2010-08-01
- User named Kovid Goyal (kovid) on fulltext search request, 2011-05-23
- License, calibre-ebook.com
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