Yes you can. See Korum v. Webasto, 769 A.2d 113 (2000). Such a waiver is a standard part of many forms such as those used by Orrick and Clerky, and I use it myself. Just has to be "expressed clearly".
Korum was a director of the company.[1] A director has duties to the company that an ordinary shareholder does not.
It's hard to see how a NDA could survive sale of the stock. If an employee sells some of their shares to another party, that party gets the right to examine the books, but isn't subject to the NDA.
Korum is cited by a line of cases in DE for the proposition that info rights are waivable as long as the waiver is expressed clearly. There may be an easier case to parse for people who are not used to analyzing caselaw, but there you go.
