mirror of
https://github.com/AppleWin/AppleWin.git
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56 lines
2.0 KiB
HTML
56 lines
2.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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<title>Copy Protected Disks</title>
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</head>
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<body style="background-color: rgb(255, 255, 255); font-family: verdana;" alink="#008000" link="#008000" vlink="#008000">
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<h2><font color="#008000">Copy Protected Disks</font></h2>
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<hr size="4">
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<p>The process of transferring disk images is complicated by the fact
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that much of the software published for the Apple II was copy protected.</p>
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<p>Software publishers have
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always looked for
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ways to prevent people from making unauthorized copies of their
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software. Today, when you buy a game, it might ask you for a word
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from a random page of the manual, to ensure that you have
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purchased the game (complete with manual) and not just copied the
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disk. Back in the days of the Apple II, publishers were much more
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direct: they simply tried to make it physically impossible to
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copy the disk. </p>
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<p>Unlike the PC, the Apple II
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had to perform
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much of its disk encoding in software. If programmers wanted to
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get tricky, they could bypass the operating system and do their
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own encoding, possibly changing the size of the sectors on the
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disk or the way in which the sectors were identified or stored.
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This prevented standard operating systems like DOS, along with
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their standard copying utilities, from accessing the disk. </p>
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<p>However, programs which were
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copy protected
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in this manner could still be copied with more sophisticated
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"nibble copiers", which copied each track on the disk
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bit for bit, rather than copying a sector at a time. Similarly,
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to get a program like this to run under AppleWin, all you need to
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do is make a nibble image of the disk. </p>
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<p>After nibble copiers became
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prevalent on
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the Apple, some software publishers developed tricky new ways of
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creating disks that even nibble copiers could not copy. It is
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unlikely that such a disk could be successfully transferred into
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a disk image. </p>
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</body>
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</html>
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