xtide-wvs licensing and copyright info
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These files were published on the National Geophysical Data Center
(NGDC) 5-Minute Gridded Global Relief Data CD-ROM (ETOPO5), 1993, and
are public domain.  They are available from NOAA at
http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO5/BOUNDARY/WVS.  Related
information is available at
http://www.ngdc.noaa.gov/mgg/fliers/93mgg01.html.  If the files are
obtained from NOAA, the filenames must be changed to all lowercase
letters to work with XTide.

http://www.flaterco.com/xtide/files.html#WVS