chmod

Short:        A protector clone with MuFS support
Author:       zander@hio.hen.nl (Thomas Zander)
Type:         disk/misc
Architecture: m68k-amigaos

Chmod is a unix program with which you can protect files with their 
hex numbers. I found that the amiga could use a program, like that.
Here it is chmod 4faa <file> means: protect file with s rwed re re. Mufs format.