Purposefully fudged schematics
bpritts at pritts.com
Fri Jan 5 09:51:07 CST 2007
A long time ago I was involved with licensing databases
(of new and used car price books-- e.g. Edmunds, Kelley Blue Book,
They had the custom of salting the data with a few deliberate
errors so that in the event of an infringement suit,
they could prove that their data had
been copied by the infringer, rather than independently created.
I can't say whether the same purpose applies to schematics,
but it just might be.
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To be certain, some errors/additions are deliberate; Rand McNally
generally sprikles a few non-existent landmarks in their maps;
Google satellite maps have "watermarks" that can be very confusing.
I spied what looked to be clearing on some of my forested land and
hiked to the very spot and found--trees, just like everywhere else.
It took some conferring with a USGS employee to discover that what I
thought was a clearing was a rather subtle watermark (viewed in just
the right way, you can make out a "Go".
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