celestia and JPL license

[Mathias Weyland <mathias@weyland.ch>]

Hi

Some time ago I adopted the celestia package. The package contains textures
which seem not to be DFSG free. (see bug #174456).

It looks like the main problem is the NASA's JPL license[1]. I have two
options now: Either I replace those textures by DFSG-free ones, or I move
the package to non-free. I'm trying to find suitable textures for the first
option, but unfortunately, I don't understand what makes the JPL policy
DSFG-nonfree :(

I have to know this because I don't want to replace non-free textures with
new textures which are non-free as well.

Best regards

Mathias Weyland



[1] http://www.jpl.nasa.gov/images/policy/index.cfm