: Re: Does something about DjVu prevent making a free viewer on iOS? Is there something about the technology and rights to the DjVu ebook format that explains why it's only available for iPhone by

@Candy

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As for patents, it seems they should expire soon.

As for tools, the compression ratio depends havily on the quality of foreground/background separation. My experience confirms that the commercial software is usually better in this respect.

I should note however that Jakub Wilk's didjvu allows to select one of several foreground/background separation algorithms. So at least in theory it allows to obtain a better compression than with the DjVuLibre tools.

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