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Originally Posted by ActiveCaptain
I have a sincere question about CM93. I see various places to download it. I imagine that the "93" is from 1993 so it is probably a little old but may well be good enough for navigation in a lot of places.
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Nope it's just a name they're still updated for legacy customers, there is a 2009 version floating about even.
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My question is, can you buy SM93 data? Is it licensed? Are these free downloads just going around the copyright sort of like music is shared?
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I have seen it around
for sale, for instance
here [Edit: that's 93/3 already, so it seems 93/2 has indeed been phased out].
Yes, packages that are shared online and in the community are "circumventing copyright law". Sharing things is against all sorts of laws, particularly in the US.
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The CM93 data seems to come from C-Map. They only have NT+, MAX, and MAX Pro today so maybe CM93 data is really free?
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Since you're from the US you might not be aware that selling taxpayer-funded
charts back to the taxpayer is BIG business anywhere else in the world.
For 93/3 and all later formats, the publisher has started using encryption to make aforementioned sharing harder (or impossible). This parallels the development in raster charts with the encrypted BSB4+ formats.
AFAIK CM93/2 has NOT been released into the public domain, although you may wish to drop Boeing/Jeppersen an e-mail suggesting as much.