There was a similar situation at work where they were making us sign a sheet of paper they said was to make us 'aware' of our rights for breaks and lunches. On the paper, they had added a 'by signing this you agree to waive your right to additional breaks or lunches if while working overtime'. Basically, after 8 hours, you're allowed another 15m break, and after 10 hours another 30m unpaid lunch...
I thought this was lame and said I'll sign the area that says I'm aware of my rights, but I will not sign away my rights. I made a copy of the paperwork for my own records and returned it unsigned, and as a manager I told my employees they should avoid signing that as well. Needless to say, we had corporate HR down a few weeks later, that notice was removed from all records and another merely informing employees of their rights was distributed and we no longer have our HR person...