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.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 5572    8920  62.5% -lh5- 1348 Jan 20  1996 chmod/chmod
[generic]                  958    1970  48.6% -lh5- b74d Jan 29  1996 chmod/chmod.doc
[generic]                  912    2044  44.6% -lh5- 7ce1 Jan 22  1996 chmod/src/chmod.c
[generic]                   41      41 100.0% -lh0- 8dbf Jan 29  1996 file_id.diz
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         4 files    7483   12975  57.7%            Dec 24  1997