License
JExplorer (and power toys such as JOCR, JMounter, and JCalculator) is a freeware. You are free to use JExplorer at your own risk and free to distribute JExplorer in its original state to your friends, public web site, online service, or BBS without explicitly obtaining the author's permission. There is no charge for any such distribution. Notification would be greatly appreciated though !
The redistribution of any DLL or ActiveX control included in JExplorer is not allowed without written license from the author. You can just distribute JExplorer setup file in its original state. The previous permission of the author is required if you wish to distribute JExplorer by any other means such as floppy disk, CD, or any other software media.
Compression/decompression
JExplorer features built-in support for most popular compression (ZIP/LHA/CAB format) and various decompression (ZIP/RAR/ARJ/LHA/CAB/TAR/ACE). JExplorer has a dedicated license to redistribute Common Archivers Library DLLs (compression - LHA/CAB, decompression - ZIP/RAR/ARJ/LHA/CAB/TAR) as it is in the setup file.