He wouldn't let his son sign anything without reading it himself - and he laughed at the waiver and explained things to us. Took a long boring while, IIRC.
He said unequivocably that waivers of rights are not worth the paper they were printed on - that rights cannot be waived.
So far as things like privacy goes, of course, there is no 'right' in the first place. Apparently, this got started a long time ago, when people tried to enforce contracts restricting the right to vote.