The following are snippets of Peering Policy Clauses found in the Peering Rules of the Road - A Brief Study of Peering Policies study.  Clauses were categorized and put into rough categories for comparison.

Here are the clauses we categorized as requirements for NDAs and/or Contracts

Excerpts from Peering Polices

NDA Required

The two Internet Networks must enter into a Mutual Non-Disclosure Agreement and an Interconnection Agreement. – Verizon

The applicant must execute an AOL Non-Disclosure Agreement (NDA). – ATDN

Potential  peers must be willing to enter into agreements with RCN, though no execution of agreements is presently required for public   peering.  Private peering with RCN requires the execution of   a Bilateral Peering Agreement (BLPA). The transmission of a   BLPA requires a non-disclosure agreement (NDA) be in place between the respective parties. All discussions regarding   private peering are under NDA. -- RCN

Willingness to enter into a Bilateral Interconnection Agreement and Non-Disclosure Agreement with Cox Communications. – Cox

Applicant should be willing to enter into an NDA before formal discussions begin. – Comcast

Upon request Peer shall execute a LambdaNet Non-Disclosure Agreement (NDA). – LambdaNet

# Enter into a standard peering agreement and mutual non-disclosure agreement with New Edge Networks as requested. -- NewEdge

Must enter into a NDA & Bilateral Interconnection Agreement and assume financial and provisioning responsibility for cross connects on an alternating/bilateral basis – Charter

Potential peer must be willing to enter into a Non-Disclosure Agreement. – Cablevision

BLPA Contract Required

3.1. The Requester and AboveNet must enter into a bilateral Peering Agreement. – AboveNet

The two Internet Networks must enter into a Mutual Non-Disclosure Agreement and an Interconnection Agreement. – Verizon

Potential  peers must be willing to enter into agreements with RCN, though no execution of agreements is presently required for public   peering.  Private peering with RCN requires the execution of   a Bilateral Peering Agreement (BLPA). The transmission of a   BLPA requires a non-disclosure agreement (NDA) be in place between the respective parties. All discussions regarding   private peering are under NDA. – RCN

Willingness to enter into a Bilateral Interconnection Agreement and Non-Disclosure Agreement with Cox Communications. – Cox

Applicant agrees in writing to Tinet's peering policy – tinet

# Private Peering shall be backed by a contract. – LambdaNet

# Enter into a standard peering agreement and mutual non-disclosure agreement with New Edge Networks as requested. – NewEdge

Must enter into a NDA & Bilateral Interconnection Agreement and assume financial and provisioning responsibility for cross connects on an alternating/bilateral basis – Charter