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Ian & Stuart's Australian Mac 1993 September
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September 93.iso
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SoftLock 1.5
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SoftLock 1.5 User Guide
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1992-01-16
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SoftLock 1.5 User Guide
by David Davies-Payne
16th January 1992
© 1990-1992, All Rights Reserved
CONTENTS
What is SoftLock?
Why Lock Disks?
How To Lock a Disk
Using Passwords
Advanced Features
System 7 Features
Shareware Details
Version History
Warranty
WHAT IS SOFTLOCK?
SoftLock is a utility that enables you to write-protect a disk in
software alone. The software lock is part of the Macintosh™
operating system, and is analogous to sliding the write-protect
tab on a floppy disk. SoftLock allows you to lock and unlock disks
easily. SoftLock can not unlock a disk that is physically locked in
hardware.
One of the advantages of SoftLock is that hard disks can also be
locked to prevent changes. An optional password will prevent
the program from unlocking a disk until the correct password is
entered.
WHY LOCK DISKS?
Locking a disk prevents the disk from being changed in any way.
No files can be modified or thrown away. If you have a disk that
you only want to read from but never change, locking the disk
will ensure that no files are accidentally modified. This has been
found to be of use in the student teaching area, where disks can be
handed out as if they were text books, and the teachers can be
sure the contents will not be accidentally or maliciously altered.
If you are creating a HyperCard™ stack that will run from a
CD-ROM, locking the hard disk will simulate the read-only environ-
ment of the CD-ROM drive, and allow you to ensure that the stack
will run correctly.
If your hard disk is partitioned, one or more partitions can be
individually locked to preserve their contents. If you have a
partition reserved for your applications, locking that partition
should ensure that those applications are never infected by a virus.
(This can not be guarantied as a virus may one day be written that
defeats the software lock, but as yet none are known to have this
capability.)
HOW TO LOCK A DISK
The main window (titled SoftLock) has five buttons: Lock, Unlock,
Eject, Drive, and Disk Info. To lock a disk click the Lock button. To
unlock a disk click the Unlock button. If a disk is physically locked,
SoftLock can neither lock or unlock the disk. This will be evident
as the Lock and Unlock buttons will be dimmed.
Clicking the Drive button will cycle through all the mounted disks.
If there are less than two disks currently mounted, the Drive button
will be dimmed. Clicking the Eject button will eject the current disk.
If the current disk can not be physically ejected, the Eject button
will be dimmed.
Clicking the Disk Info button will bring up a window giving inform-
ation about the current disk. The information includes: when the disk
was created and last modified, the amount of free space on the disk,
how many times the disk has been written to, and the number of files
and folders it contains.
All five buttons have keyboard shortcuts associated with them.
You can lock a disk by pressing the 'L' key, and unlock a disk by
pressing the 'U' key. Similarly 'E', 'D' and 'I' are shortcuts for the
Eject, Drive and Disk Info buttons respectively.
When a disk is locked, a lock symbol is drawn next to the disk's
name. When the disk is software locked the lock symbol is unfilled.
When the disk is physically locked, the lock symbol is filled.
Some programs, such as the Finder™, also display the lock status
of disks. To ensure that this information is kept up to date, SoftLock
forces all other windows to be redrawn whenever a disk is locked or
unlocked.
USING PASSWORDS
Sometimes it may be necessary to prevent an unauthorised person
from unlocking a disk that has been locked with SoftLock. In order
to achieve this a password can be installed as the disk is locked.
When unlocking a disk, SoftLock looks for this password, and if found
will only unlock the disk if the identical password is entered.
To specify a password choose the 'Set Password…' item from the
'Options' menu. You will be asked to enter a password twice. The
text of the password will not appear on the screen, instead a number
of dashes will mark the characters as they are typed. Once entered,
the 'Set Password…' menu item will be checked to inform you that
the password will be used whenever a disk is locked.
To stop using a password, again choose the 'Set Password…' item,
clear the hilited text, and click OK. The 'Set Password…' item will
no longer be checked.
When unlocking a disk that was locked with a password, a dialog
will appear asking you to enter the password. Type in the password
exactly as saved (including case) and the disk will be unlocked. As
before the text of the password will be masked by dashes.
SoftLock can only unlock a disk if the correct password is entered.
Note that the password encryption formula has changed since the
program was first released. This version of the program can unlock
disks locked with a password using previous versions, although the
reverse may not necessarily be true.
If you do forget the password for a locked disk, your only option is
to copy the contents to another disk, and erase the locked disk with
SoftLock or Disk First Aid. See the next section for details.
ADVANCED FEATURES
When a disk is locked or unlocked, the windows in all other open
applications are redrawn to ensure that their information is correct.
As this process may take time, it can be disabled by toggling the
'Always Redraw Windows' item in the 'Options' menu. Note that if
disabled, the information displayed in the Finder may not be correct.
When locking a disk with a password, a warning appears to ensure
that you intend the password to be used. This warning can be pre-
vented from appearing by choosing the 'Disable Warnings' item from
the 'Options' menu.
If a password is forgotten, your only option is to choose the 'Erase
Disk…' item from the 'Options' menu. Choosing this option will unlock
the disk and delete all of its files. Note that you can not erase a disk
that is physically locked, or the disk used to start up the Macintosh,
or the disk containing the SoftLock program.
SYSTEM 7 FEATURES
SoftLock makes use of a number of system 7 features, principally
balloon help, and AppleEvents. SoftLock has balloon help for all
menus, dialogs and controls.
Under system 7 a disk can be locked or unlocked by merely dragg-
ing the disk icon to the SoftLock icon and releasing. If the disk is
unlocked it will be locked, if locked it will be unlocked. SoftLock’s
windows will then be hidden, and the Finder will be brought to the
front. If the disk is physically locked, a beep will sound.
SHAREWARE DETAILS
SoftLock is not free, it is shareware. If you wish to use it, you
should send US$10 or equivalent to the author at the following
address. By sending in the money you will encourage further
improvements to this and other useful programs.
Please send your name, address and shareware fee to:
David Davies-Payne
12, Grosvenor Terrace,
Wadestown,
Wellington 1
New Zealand.
In return, I will send you improved versions of the program, as
they appear. I can be contacted via electronic mail at
DAVPAYNE@OTAGO.AC.NZ
Your support is greatly appreciated, and I am always open to
comments and suggestions.
VERSION HISTORY
Version 1.5 (16/1/92) automatically updates all other windows.
Drag and drop capability added. Reduced partition size to 110K.
Improved documentation.
Version 1.4 (30/10/91) added some System 7.0 features, such
as help balloons. Help appears under the Balloon menu under System
7.0. The password dialog now hides the entered text using dashed
lines. Windows now appear in the correct places with multiple
monitors. A warning now appears when locking with a password.
This warning can be disabled. The ability to unlock a disk without a
password was added; t his process deletes all files on the disk.
Version 1.3 (24/4/91) used a new method for encrypting the
password. While 1.3 can unlock disks locked with earlier versions,
the reverse is not true.
Version 1.2 (23/3/91) added a help window.
Version 1.1 (19/2/91) sported a new interface that was Multi-
Finder friendly.
Version 1.0 (12/2/91) was the first release version of SoftLock.
WARRANTY
The author makes no warranty as to the performance of SoftLock.
The user accepts the program as it stands. The author will make
every effort to fix any bugs found in the software but is not
obligated to do so.
The user is reminded that once a disk is locked with a password,
that disk can only be unlocked by supplying the correct password.
The author is not liable for any loss of data or profits associated
with the use of SoftLock. In no event will the author be liable for
more than the price paid for SoftLock.