Is the data public domain ?
The data is produced with taxpayer funds in just about every country. Jeppesen lift it from the national AIPs and other publications, redraft it in a standard format, and sell it in various forms.
There was a legal dispute between the Australian CAA and Jeppesen, a few years ago. It was settled quietly - presumably Jepp agreed to hand over some money for the data they used to pick up for free.
Similar issues arise with Ordnance Survey in the UK, whose maps were produced with taxpayer funds but who very aggressively held onto the copyright and commercialised it as much as they could. I heard something on the news recently though ... this may be changing, and not a day too soon. I wonder what memory Map thinks of this? Most of their business is flogging O/S maps.
In the USA, the government drafts the terminal charts in a cockpit-usable form, and these are more or less free. In Europe, the governments have chosen to draft them in a form which is not really cockpit usable - A4 size and lots of small print. I once asked the CAA why don't they do it in A5 format etc; they replied they are not in the business of competing with commercial terminal chart providers.......
This is why Jepp charge far more money for terminal charts outside the USA.