A way that would work for special cases is taking away all but owner read
permissions, then using a SUID bit on the program{s} that are allowed to
actually read the file. If these programs don't provide a way to make
another copy of the file, and don't just output the file to the screen in a
way that can be redirected, you have prevented casual copying.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Robert Canary
Sent: Saturday, February 23, 2002 10:11 AM
To: [EMAIL PROTECTED]
Subject: Re: deny copying files
Depends on what your trying to keep in tact. Cat file1 > file2 will
copy all contents but the file image and timestamp has changed. So if
your using any sort of original verification schemes you could detect a
illegal copy. However, if your trying to prevent people from simply own
the file on their system then their is nothing you can do while allowing
read permissions.
Depending on the file format (ie PDF), you can set security setting to
not allow things like save or print. But those feature are dependant on
the viewer application not the file or the filesystem permissions.
Duncan Hill wrote:
>
> On Sat, 23 Feb 2002, Lewi wrote:
>
> > it that possible to restrict file to not able be copying but still can
be
> > see the contents.
>
> If I can view the contents, I can copy it.
>
> cat file1 > file2
>
> Hey presto, copied without using cp, and only by viewing it.
>
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--
robert canary
system services
OhioCounty.Net
[EMAIL PROTECTED]
(270)298-9331 Office
(270)298-7449 Fax
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