Security software.

DL #1 contains a Disk Copy image of a 400k MFS disk for v. 1.0.1,
released 1989. The disk image is not an original copy as the date on
the installer application is 2019 (other items are dated 1989).

DL #2 contains the installer for v. 2.1.2 , dated 1993

Although there was a version 1.0 of this software, it is different
from the simple write protection software [DiskLock 1.0][1] by Jeffrey
Shulman

See also: [The Norton DiskLock 3.0][2], [DiskLock 4.6.5][3]

Compatibility
Architecture: 68k

  [1]: http://macintoshgarden.org/apps/disklock-10
  [2]: http://macintoshgarden.org/apps/norton-disklock-30
  [3]: http://macintoshgarden.org/apps/disklock-465