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https://issues.apache.org/jira/browse/LUCENE-1799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780129#action_12780129
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DM Smith commented on LUCENE-1799:
----------------------------------

The sample code is probably what is on this page, here:
    http://unicode.org/notes/tn6/#Sample_Code

>From what I gather reading the whole page:
If we port the sample code and the test case and then provide demonstration 
that all test pass, then we will be granted a license.

There's contact info at the bottom of the page for getting the license. Maybe, 
contact them for clarification?

As the code is fairly small, I don't think it would be too hard to port. The 
trick is that the sample code appears to deal in 32-bit arrays and we'd 
probably want a byte[].

> Unicode compression
> -------------------
>
>                 Key: LUCENE-1799
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1799
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Store
>    Affects Versions: 2.4.1
>            Reporter: DM Smith
>            Priority: Minor
>
> In lucene-1793, there is the off-topic suggestion to provide compression of 
> Unicode data. The motivation was a custom encoding in a Russian analyzer. The 
> original supposition was that it provided a more compact index.
> This led to the comment that a different or compressed encoding would be a 
> generally useful feature. 
> BOCU-1 was suggested as a possibility. This is a patented algorithm by IBM 
> with an implementation in ICU. If Lucene provide it's own implementation a 
> freely avIlable, royalty-free license would need to be obtained.
> SCSU is another Unicode compression algorithm that could be used. 
> An advantage of these methods is that they work on the whole of Unicode. If 
> that is not needed an encoding such as iso8859-1 (or whatever covers the 
> input) could be used.    

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