What is libdmtx?
libdmtx is open source software for reading and writing Data Matrix barcodes on Linux, Unix, OS X, Windows, and mobile devices. At its core
libdmtx is a native shared library, allowing C/C++ programs to use its capabilities without extra restrictions or overhead.
The corresponding utility programs,
dmtxwrite, provide the official command line interface for
libdmtx, and serve as a code reference for programmers wishing to use the
libdmtx C API. The core library is distributed under the Simplified BSD license, and all other project software uses the LGPLv2 license.
Data Matrix barcodes are two-dimensional symbols that hold a dense pattern of data with built-in error correction. The Data Matrix symbology (sometimes casually referred as "DataMatrix") was invented and released into the public domain by RVSI Acuity CiMatrix. Wikipedia has a good page on Data Matrix and its characteristics.
The current stable version, 0.7.4, introduces big structural changes designed to make libdmtx useful for a wider audience. In practice this involved rewrites for 2 of the 3 major project components: The encoder and the Reed Solomon code.
These changes shouldn't change how libdmtx appears to calling programs, but hopefully the overall project will become more useful to developers who previously couldn't use it for a number of reasons.
02-Jun-2011:New release: libdmtx-0.7.4 (Release Notes)
26-May-2011:New official download page available
17-Mar-2011:Core library relicensed to Simplified BSD with waiver option
03-Mar-2011:libdmtx code now in SourceForge GIT repositories
29-Nov-2010:libdmtx binaries now available as official Fedora package
18-Nov-2009:Mikko Koppanen released improved PHP bindings for libdmtx
05-Nov-2009:"Onion" released a Gstreamer element using libdmtx