What do you mean by "locked behind a license"? | Hacker News

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		jwilk on May 3, 2019 \| parent \| context \| favorite \| on: PDF Is the World's Most Important File Format What do you mean by "locked behind a license"?

hcs on May 4, 2019 [–]

There are a few patents involved: http://djvu.sourceforge.net/licensing.html

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