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## Introduction

|  | DEScoder - Freeware Lisp encryption utility for BricsCAD

This software provides strong BlowFish encryption for AutoLISP files - these encrypted AutoLISP files can only be used and loaded by BricsCAD system.

DEScoder is mainly designed to support AutoLISP application developers, providing a maximum comfort for the development cycle, and to protect the application code.

Main functional features

- single file mode to encrypt specified file using BlowFish algorithm
- project mode to create encrypted "container" file, wrapping multiple AutoLISP, DCL and Text files into a single encrypted file
  (similar to AutoCAD VLX application files)
- VLX compatible *.prv and *.prj project files - this allows to use the project file for BricsCAD and AutoCAD, to create *.vlx application file for AutoCAD, and *.des application file for BricsCAD, based on the same, identical project definition
- Lisp and DCL compression to reduce file size, providing faster application load
- VLX NameSpace feature is supported (since BricsCAD version >= 18.2 !)

Main convenience features

- BLADE Debugging support, since v2.9, DEScoder generates DES file which allow active debugging using BLADE, by storing the name of the original Lisp source file(s) into DES, to allow access and use of the original source file when needed (and if the original source file(s) are available, usually on developer's computer only)
- drag & drop support for all relevant dialog controls
- command line support for batch processing
- wildcard support for file specification in command line mode
- program dialog is resizable and persistent (size and positions are maintained across sessions)
- singe file history for last-used 30 Lisp source files for quick access to most often used Lisp files
- project history for last-used 30 projects for quick access to most often used projects
- automatically reload last-used project at startup, to quickly rebuild that last-used project with a single click
- tooltips provide assistance for beginners, can be disabled

For a detailed description please refer to chapter Using DEScoder.

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