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+libecwj2 is a library that gives support to GDAL for reading, import,
+and convert raster geospatial data in non-free ECW and JPEG 2000
+formats. This library was released as free and open source in 2006 by
+Earth Resource Mapping, formerly owner of ECW patents.
+
+ECW (Enhanced Compression Wavelet) is a full proprietary standard of
+compression image format. 
+JPEG 2000 (or JP2) is a similar standard under free concession but 
+protected by patents in some parts.
+
+Both the formats are more powerful than other formats in lossy 
+compression of large image data without significant losses of quality,
+but are mainly accessible through proprietary software, specially to
+manage geospatial data.
+
+libecwj2 is the only one free and open source library that includes
+the support to these formats in GDAL and indirectly in platforms that
+require it as dependency (i.e. QGIS and Orfeo Toolbox). GDAL can be
+also used to convert ECW or JP2 files in other graphic formats.
+
+After the installation, to apply the support to ECW/JP2 formats, GDAL
+must be rebuilt without any other setting: libecwj2 is an optional
+dependency autodetected.
+
+To verify if the plugin is enabled, you can launch the following
+command:
+
+   $ gdalinfo --formats | grep ECW
+   
+If the plugin is successfully enabled, this command returns
+
+  ECW -raster- (rw): ERDAS Compressed Wavelets (SDK 3.x)
+  JP2ECW -raster,vector- (rw+v): ERDAS JPEG2000 (SDK 3.x)