Int 21 Fn 4303  - Dr Dos 3.41+ Internal - Set Access Rights And Password   [O]

   AX = 4303h
   CX = access rights
        bits 11-0: access rights (see #1108)
        bit 15: new password is to be set
   DS:DX -> ASCIZ pathname
   [DTA] = new password if CX bit 15 is set (blank-padded to 8 characters)

Return: CF clear if successful
   CF set on error
       AX = error code

Notes: if the file is already protected, the old password must be added after
     the pathname, separated by a ";".  As with all password handling in
     DR DOS, the old password is processed by the kernel, not any
     applications or utilities making the call.
   this function is documented in DR DOS 6.0 and corresponds to the
     "Get/Set File Attributes" function, subfunction 3, documented in
     Concurrent DOS.

See Also: AH=0Fh,AH=17h,AX=4302h"DR DOS",AX=4305h,AX=4454h