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DjVu is a computer file format designed primarily to store scanned images. It features advanced technologies such as image layer separation, progressive loading, and arithmetic coding, allowing for high quality, readable images to be stored in a minimum of space. Progressive loading makes the format ideal for images served over the internet. DjVu has been promoted as an alternative to PDF, actually outperforming PDF on most scanned documents. Like PDF, DjVu can contain an OCReded text layer, making it easy to perform cut and paste operations.

The DjVu technology was originally developed by Yann Le Cun, Léon Bottou Patrick Haffner and Paul G. Howard at AT&T Laboratories;. The ownership rights to the format have been transferred to different companies over the years, including AT&T; and LizardTech. The original authors maintain a GPLed implementation named "DjVuLibre".

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