<I have heard through contacts at a company providing sponsored funding
<information searches that the most recent version of the NIH keyword
<index (probably version 4) was developed for the NIH by an outside
<company and the company holds the copyright.  Access to it for use
<in other software programs/products is apparently pretty limited.
<Strictly heresay, but thought it might be of interest.

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My understanding is that version 5 is the latest edition (in fact I have a
copy of it) and the reason that Infored is using version 4 is because it is
NOT copyrighted.  Oh how I wish there were one universal thesaurus!