locking cad files

there was something recently about this but now I cant find it - anyone able to help
I want to be able to give drawings out to be used but not altered
I think it was CADLOK or something like that
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www.cadlock.com
--

Chip Harper

http://home.comcast.net/~hot4cad /
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...or simply print them as .pdf files.
there is a link to a free pdf creator (ghostscript) on our web site.
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Sincerely;

Support Dept.
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