/usr/share/doc/unalz/README.Debian is in unalz 0.65-1.
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Supported formats
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Unalz supports two different kinds of ALZ formats which were
introduced by proprietary Alzip program by Estsoft Corp. The first
BZIP2 based ALZ format was the default format of Alzip 4.9. Alzip 5.0
and later versions have used the newer DEFLATE based format.
In May 2009, "Alzip EGG Edition" test release implements another "EGG
format". But its details are not known yet and it's not supported by
unalz.
Dynamicaly linked with zlib and libbz2
--------------------------------------
ALZ format doesn't implement its own compression algorithm. Instead it
just uses BZIP2 or DEFLATE algorithms. That's why the unalz source
contains zlib and bzip2 library source code. But unalz Debian package
doesn't use that embedded library source and it's dynamically linked
with system-installed library packages, to reduce the binary size and
to minimize possible future security problem by zlib and bzip2.
-- Changwoo Ryu <cwryu@debian.org>, Sun, 02 Aug 2009 02:32:54 +0900
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