Everything is negotiable. If they present you with an NDA that you aren't comfortable signing then counter with something you are willing to sign. These things are negotiated all the time.
Not that long ago I was presented with a copyright assignment contract that if I signed would allow their lawyers to enter into arbitrary agreements for me without even telling me. I simply emailed them back and asked them to remove that clause. They did without complaint.
And just today I presented a Statement of Work to a client and we exchanged emails over making sure the rights to the work were defined correctly for what they wanted. I had intended to allow them to do what they were asking but my original wasn't clear. So I reworded it so it was clear to everybody.
Not that long ago I was presented with a copyright assignment contract that if I signed would allow their lawyers to enter into arbitrary agreements for me without even telling me. I simply emailed them back and asked them to remove that clause. They did without complaint.
And just today I presented a Statement of Work to a client and we exchanged emails over making sure the rights to the work were defined correctly for what they wanted. I had intended to allow them to do what they were asking but my original wasn't clear. So I reworded it so it was clear to everybody.