The CurrCon Java Applet displays prices on this
web page converted with today’s exchange rates into your local international currency,
e.g. Euros, US dollars, Canadian dollars, British Pounds, Indian Rupees…
CurrCon requires an up-to-date browser
and Java version 1.7 or later, preferably 1.8.0_05.
If you can’t see the prices in your local currency,
Troubleshoot. Use Chrome for best results.
PkWare version 14Last revised/verified: 2012-05-23
creates various compression utilities including PKZIP for Windows (
) and Unix, including various types of encryption as well. You can buy a DCL (Data Control Language) library to do compression in your
own programs. The catch is, it only handles compression of an array of bytes, basically a GZIP class. It cannot deal with the complex PKZIP archive format. The documentation on how to use
PKZIPc.exe, the command line version, is in a file called Program Files\PKWARE\PKZIPC\PKZIPc.pdf. PKZIP.exe is the old
DOS-command line compatible version. The gui interface program is called PKZIPw.exe.
PKZIP can decompress zip, jar, tar,
gz, and tar.gz files.
PKZIP offer a free reader that can decompress any format of zip file, but not compress them. This allows you
to unzip even files compressed with PKWare proprietary formats.
Pkware’s founder, Phil Katz wrote PkArc for DOS (Disk Operating System) to compress
files. It used the same format as SEA Arc.
In the legal battle that ensured, Katz was blocked from using the arc format, a major blow to computer industry
as a whole because the ruling broadly interpreted copyright to effectively include algorithms and file formats.
Katz’s code was in assembler and was much faster than the high level SEA code. The issue was muddied
because Katz had seen SEA’s code. Katz then created the Zip file format and made it public domain so
competitors could use it to. It has become the defacto compression standard. It is also used in Java jar and war files. Katz died in 2000.