Welcome to the
MapImagery Encryption on-line Help. This Help file
provides the basic information you need to start using
MapImagery Encryption is a set of tools for creating and using encrypted
ECW imagery files. MapImagery
Encryption allows imagery to be distributed publicly, for
example on DVD, CDROM, intranet file system, or via the Internet.
But only to be viewed by users with an appropriate key.
Optionally it is also possible to specify that the imagery can only
be decrypted using a particular software product, or even by a user
with a particular network address.
The encrypted imagery files created and used by
MapImagery Encryption have a .MIE file extension. The MIE format,
developed by MapImagery Limited, is an encrypted form of the
ECW wavelet compression format, consisting of a simple header
containing metadata, and a body containing the encrypted ECW data.
MapImagery Encryption key files have an
.MIK file extension.
ECW is a wavelet compression
standard developed by Earth Resource Mapping that provides high quality image compression.
Many data and software vendors are adopting ECW as their standard image compression
Decryption of MIE files are done on the fly so that
the imagery is not left as temporary files on the users hard disk.
By combining both ECW compression and MIE encryption seamlessly,
MapImagery Encryption provides an extremely useful solution for data and
software vendors, wishing to distribute proprietary imagery, in a
The initial version of
MapImagery Encryption is packaged as a part of MapImagery. A version of
the MapImagery Encryption, packaged as a stand-alone product may be produced
in the future. For more
information, or to download a demonstration version of
MapImagery Encryption , see the MapImagery web page at http://www.mapimagery.com
This document has the following sections: