That's a great question. I hope the following is specific enough.
Karen Peetz violated Standing Order IV.(1)(b) of the standing orders that existed at the time she made her statements on the afternoon of 7/12/2012. In the press conference given the afternoon of the Freeh Report release, then Chairwoman Peetz led her statements with the following:
"The Board of Trustees as a group that has paramount accountability for overseeing and ensuring the proper functioning and governance of the university accepts full responsibility for the failures that occurred."
Quite clearly she is accepting the conclusions in the Freeh Report on behalf of the full board.
The interesting thing about the standing order that she violated is that it has since been deleted and no longer exists on the Penn State Board of Trustees website. The standing orders underwent revisions, some small and some not small at all, on May 2011, July 2012, May 2013, and November 2014. It's that latest one that is current and available on the website.
It was the May 2011 revision that Peetz violated. The July 2012 revision was approved the day after she made her statements, but, the relevant clause hadn't been changed. The legal risk caused by her statement couldn't have been predicted early enough to change the applicable clause. That happened in May 2013 when the standard orders underwent a wholesale change. Changing everything made it much easier to hide a change to one clause. The orders were drafted and finalized sometime in the three months following the release of the Paterno Reports of February 2013, and then voted on and approved at the May 3, 2013 board meeting (the record reflects one negative vote from Lubrano). Were university lawyers aware that the Paterno lawsuit was soon to be filed, at the end of May?
The order she violated from the May 2011 revision was:
ORDER IV. MATTERS REQUIRING APPROVAL OF THE BOARD OF TRUSTEES
(1) Basic University Organization and Policy
(b) All reports of standing or special committees of the University's Board of Trustees.
The Freeh report was specifically contracted by the Special Investigative Task Force, which was just a name given to a "special committee" of the board, thus the Freeh report was a report of a special committee. Karen Peetz, on behalf of the full board (and without their approval or vote), accepted full responsibility for the failures identified by the Freeh report.
At the November 11, 2011 board meeting it was reported from the Executive session that a special committee was created to investigate the failures that occurred. It was the Special Investigative Task Force (SITF) co-chaired by Ken Frazier and Ron Tomalis. The SITF is clearly just a name for a special committee of the board. It was described that way to the full board, as evidenced by comments recorded in the minutes. President Erickson (in his very first remarks as president) and Ken Frazier (in his initial remarks about the creation of the SITF) both referred to the SITF as a "special committee". Even the initial draft of the Freeh engagement letter includes "special committee" throughout the letter. These instances were later revised by hand to clarify the specific name of the special committee as the SITF.
It's clear that Peetz violated that standing order. All special committee reports require approval by the board. It is reasonable to conclude that a verbal acceptance by one member of the board, just a few hours after it became available to the full board for review, does not constitute board approval.
------ Reference links & more
7/12/2012 Remarks by Peetz, starting at the 5:15 mark
Web archive snapshots of Penn State Board website, which includes links to standing orders
http://web.archive.org/web/*/http://www.psu.edu/trustees/charter.html
5/2011 standing orders (archived on 7/1/2012)
http://web.archive.org/web/20120319190434/http://www.psu.edu/trustees/pdf/standingorders.pdf
7/13/2012 Board meeting minutes indicating changed standing orders (Peetz's remarks from 7/12/2012 are included in the minutes, with some extra, introductory words)
http://www.psu.edu/trustees/pdf/july2012minutesbot.pdf
7/13/2012 standing orders (archived on 11/7/2012)
http://web.archive.org/web/20121107142442/http://www.psu.edu/trustees/pdf/standingorders.pdf
5/3/2013 Board meeting minutes which includes an Appendix (p.67) with the new and just approved standing orders (this happens to be same meeting with the infamous Frazier outburst at Bill Cluck; the minutes indicate William Cluck was scheduled to speak to the proposed changes to the Charter, Bylaws, and Standing Orders.)
http://www.psu.edu/trustees/pdf/may2013minutesbot.pdf
Here is an article from 5/2/2013 discussing the proposed structural changes to the board. They were described as the "most comprehensive change" made to board organization documents in history.
http://onwardstate.com/2013/05/02/board-of-trustees-to-vote-on-structural-changes/
11/2014 standing orders (the most recent version, for completeness)
http://www.psu.edu/trustees/pdf/Standing Orders November 2014.pdf
11/11/2011 board minutes
http://www.psu.edu/trustees/pdf/november2011minutesbot.pdf
11/18/2011 Freeh engagement letter
http://onwardstate.com/2013/03/11/penn-state-releases-letter-of-engagement-with-freeh/
One remaining question is whether the standing order Peetz violated was deleted when university lawyers recognized a legal risk related to the pending Paterno lawsuit. It could simply be coincidental timing. However, and notwithstanding public relations issues, it's clear Peetz's statements placed the university at a weaker position related to victim lawsuits, with the majority of settlements announced five months later after changing the standing orders, the majority of which settled in October 2013.
http://news.psu.edu/story/293049/2013/10/28/administration/settlements-announced-sandusky-victims
Then again, it should have been easy to predict that the university would be drawn into the Paterno vs. NCAA lawsuit as a nominal defendant. A large crux of recent arguments in that case revolve around the NCAA's assertion that certain university officials "accepted" the Freeh report. See p.11 of the 7/1/2015 Paterno filing.
http://co.centre.pa.us/centreco/media/upload/PATERNO VS NCAA PLAINTIFFS REPLY BRIEF IN SUPPORT OF MOTION FOR JUDGMENT.pdf
Now some might try to argue that as Chairwoman, Peetz could accept responsibility on behalf of the board. The problem with that is what happens when the same argument is applied to then-chairman Masser's comments a year later when he stated that the Freeh report amounted to "speculation"? Would that then mean Peetz's initial acceptance had just been un-accepted?
http://www.usatoday.com/story/news/...n-state-sandusky-sexual-abuse-report/2521703/