gberz3 wrote:

I'm currently working with a client that needs to manipulate FITS
files. However, they want a 100% proprietary solution. They know the
[...]

My question to the group is: What librar(y/ies) would you all
recommend for working with FITS files? Currently I've been looking
at "http://heasarc.gsfc.nasa.gov/docs/software/fitsio/fitsio.html".

sorry, can't help it, but to me 100% proprietary and using the
fitsio library are a contradiction in terms.

Aloha,
Maren