Does that paper constitute admissible evidence in court? If so this is very dubiously legal and borders on blackmail. Although it's probably more likely that y

Does that paper constitute admissible evidence in court? If so this is very dubiously legal and borders on blackmail. Although it's probably more likely that you can't sign away or admit guilt without correct legal procedure, and such documents are simply not worth anything (i.e. like user-agreements which supposedly say you waive your rights to legal action). Would be interesting to see someone with a legal background comment on this.