Yes, it seems there is - the ACC Constitution and Bylaws. Someone posted on a Ga. Tech or Va. Tech board a copy of the 2020-21 version:
https://gtswarm.com/threads/acc-ad-meetings-new-revenue-distribution-model.26989/page-5
I don't know if there have been amendments since then, but I'll assume not to the provisions that would matter for these purposes. For reference/interpretation by others, I'll paste in below what appear to be the potentially relevant provisions related to television rights, distributions, rights of Members and withdrawing Members and what the necessary votes would be to amend relevant documents.
It seems clear to me that, under Section 1.4.5 of the Constitution and Sections 2.5.2 and 2.10.9 of the Bylaws, withdrawing members get nothing (other than I suppose the distribution they would be due for the year in which they withdraw) from the Media Rights or any other Conference distributions of revenues.
On the point noted above about how the amend the Grant of Rights, whether or not outside observers consider it "insane," the language in Para. 8 seems to me to clearly provide that it can only be amended by unanimity: "This Agreement may not be modified or amended
other than by an agreement in writing signed by duly authorized representatives of the Conference
each of the Member Institutions that are then members of the Conference." I don't think there's too much risk of courts not ruling that "each" means each and every/all.
Potential ways around this with votes more like 2/3 or 3/4 than unanimity, I suppose might be to try to amend the Constitution or the Bylaws to change the revenue distribution rules or to expel members or to amend the ESPN Agreement. But, even if any of those steps could get around the GOR, it would still require at least 10 of the current members or 12 after the new schools join in a few months. So, the 7 who were trying to do it last year wasn't enough.
The main ambiguity I see between the Constitution/Bylaws and GOR is whether a mere majority could vote to dissolve the league (which, arguably would be true per Section 1.6.2 of the Constitution since dissolution isn't one of the "absolute 2/3" or "absolute 3/4" matters). I do think dissolution of the league would get around the GOR, as the GOR only grants to the Conference the "rights necessary for [the ACC] to perform the contractual obligations of the Conference expressly set forth in the ESPN Agreement," and I recall seeing someone posted that the ESPN Agreement requires the ACC have at least 15 members (and, presumably, that it exists). So, dissolving the league would enable ESPN to void the Agreement and render the GOR irrelevant.
My guess is that this is what the group of 7 was looking to do last year -- to find an 8th vote to dissolve the ACC. That will of course be tougher to do once the league expands to 18, as they would need to find 10 votes to dissolve the ACC. I don't see that happening in the near-ish future unless there is some combination of pulling together a simultaneous decision--which would require collaboration between Fox and ESPN--to say, add Florida St., Ga. Tech, Stanford and Cal to the BIG, UNC, Virginia, Virginia Tech and Clemson to the SEC, and Miami and NC St. to the Big 12 (which might finally force Notre Dame's hand to also join the BIG). In particular, it seems extremely far-fetched that ESPN would have any interest in facilitating something like this happening any time soon, as it wouldn't really move the needle for the SEC (whose rights ESPN already has), ESPN has no interest in strengthening the BIG, and ESPN would be losing the large chunk of programming it currently gets from the ACC at very favorable (to ESPN) pricing, and it would flush any value for ESPN's ownership interest in the ACC Network (not much, but also not nothing).
I do expect something along these lines to eventually happen, as we get to within 3-5 years of the expiration of the GOR and the threat of this sort of mass exit becomes more plausible, because that will lower the parties' expectations for what should be paid as a settlement/buyout to make it happen --
e.g., Texas and Oklahoma (with the help of ESPN) buying out the last year of their Big 12 GOR for about $100 million. But, for right now, it's hard to see how it makes financial sense.
Constitution
1.4.5
Withdrawal of Members. To withdraw from the Conference, a Member must file an official notice of withdrawal with each of the Members and the Commissioner on or before August 15 for the withdrawal to be effective June 30 of the following year. Upon official notice of withdrawal, the Member will be subject to a withdrawal payment, as liquidated damages, in an amount equal to three times the total operating budget of the Conference [approved under Section 2.5.1 of the Bylaws], which is in effect as of the date of the official notice of withdrawal. The Conference may offset the amount of such payment against any distributions otherwise due such Member for any Conference year. Any remaining amount due shall be paid by the withdrawing Member within 30 days after the effective date of withdrawal.
The withdrawing Member shall have no claim on the assets, accounts, or income of the Conference.
1.6.2
Required Vote. …. Except as otherwise provided herein or in the Bylaws, if a quorum is present when a vote of the Directors is taken, the affirmative vote of a majority of all Directors present for such vote shall be an act of the Board. …
The Absolute Two-Thirds Matters are as follows: (i) any amendment to Article 2.5 of the Bylaws (Finances), …, (iii)
entering into or amending any Material Media Rights Agreement [defined as one providing over 5% of Conference revenue]…, … , and (v) the initiation of any material litigation involving the Conference (but not, for clarity, the settlement of any litigation involving the Conference, which requires the affirmative vote of a majority of all Directors present for such vote).
The Absolute Three-Fourths Matters are as follows: (i) the admission of new Members to the Conference pursuant to Section 1.4.3, (ii) the expulsion, suspension or probation of a Member pursuant to Section 1.4.4, (iii)
any amendment of this Constitution, (iv) any amendment of the Bylaws (except amendments to Article 2.5), and (v) waiver of notice or other required process for a Board meeting …..
Bylaws
2.5.2
Distribution of General Revenue. The Conference shall distribute its net revenue, including but not limited to revenue from television receipts, Conference championships, participation in preseason or postseason competition, and interest from Conference funds on deposit, according to the provisions set forth in this Article 2.5. Before distributing any net revenue to the Members, the Conference shall deduct such reserves as may be determined by the Board from time to time in accordance with Section 2.5.3. Unless otherwise specified in these Bylaws (including in Section 2.12) [which deals with visiting team football ticket allotments] or any agreement to which the Conference is a party, after deducting such reserves, the remainder of the Conference
net revenue shall be divided equally among the Members and distributed in one or more installments and in equal shares to each Member by June 1, or the first business day following June 1 or such other date as determined by the Board, in accordance with the distribution plan approved annually by the Board. …
2.10
Media Rights Policy
2.10.1 Grant of Rights. The Members have granted to the Conference the right to exploit certain media and related rights of the Members (such rights, the “Media Rights”; and the agreement pursuant to which the Members granted such rights, the “Grant of Rights”).
2.10.2 Revenues from Media Rights.
Unless otherwise determined by the Board, all revenues from the sale, licensing, distribution and other exploitation of the Media Rights shall be deposited with the Conference. [Note: So, changing this would be subject to the 3/4 requirement to amend per Section 1.6.2 of the Constitution]
2.10.3 Conference Media Rights Agreements. The Commissioner shall negotiate all [Media Rights agreements] on behalf of the Conference …; provided that a
ny Material Media Rights Agreement shall require the approval of two-thirds (2/3) of the Directors and all other Media Rights agreements shall be subject to approval by the Executive Committee.
2.10.5 Member Rights. Notwithstanding Section 2.10.3, but only to the extent permitted by the Conference’s Media Rights agreements, each Member shall retain such rights that are expressly retained by the Members under the Grant of Rights and any other rights that the Board may from time to time determine may be exploited by the Members.
2.10.6 Revenues from Non-Package Games. Unless otherwise determined by the Board, all revenues derived from the exploitation by any Member of its football games and basketball games that are not included in or selected for distribution as part of any Conference Media Rights agreement (“Non-Package Games”) shall be deposited with the Conference.
2.10.8 Rights Fee for Non-Package Games. The Board may establish a rights fee for the exploitation of any Non-Package Game.
2.10.9 Distribution of Revenues. T
he revenues derived under Section 2.10.2 (Revenues From Media Rights) and Section 2.10.6 (Revenues From Non-Package Games) resulting from the ACC-ESPN Multimedia Agreement and the ACC-ESPN Network Agreement shall be divided equally among the Members in accordance with Section 2.5.2, unless otherwise provided in these Bylaws (see Section 2.12 [re: Notre Dame]).
2.11.3.4 Dissolution Clause. Upon the dissolution of the Conference, the Board shall dispose of all the assets of the organization exclusively for the purpose of the organization in such manner, or to such organization or organizations organized and operated exclusively for charitable, educational, religious or scientific purposes as shall at the time qualify as an exempt organization or organizations under Section 501(c)(3) of the Internal Revenue Code of 1986 … , as the Board shall determine. Any of such assets not so disposed of shall be disposed of by the state court of jurisdiction in which the principal office of the organization is then located, exclusively for such purposes or to such organization or organizations as said court shall determine which are organized and operated exclusively for such purposes.