[murgindrag]

The reaction to "no" can be multiple:

* OP is in the wrong and employer can't afford to pursue further. OP loses a lot of reputation as word spreads.

* OP is in the wrong and employer can't afford to pursue now. Five years down the line, when Oracle acquires employer, OP is sued for five years of damages.

* OP is in the right, but employer's lawyer crafts a very intimidating and compelling legal letter. OP backs down, having blown the relationship with the lawyer, loses rights, and is fired two months later.

It's helpful to be able to say "no" with conviction if one is right, or not press an issue if one is wrong.