Common use of Comm Clause in Contracts

Comm. Platform 8.1.1 -------------------------------------------------------------------------------- JRE/JVM 1.1.7b and 1.1.8 -------------------------------------------------------------------------------- Confidential materials omitted and filed separately with the Securities and Exchange Commission. Asterisks denote omissions. ATTACHMENT 12.7 ESCROW AGREEMENT ---------------- Account Number ______________________ This Agreement is effective _________________, 2000 ("Effective Date") among Fort Know Escrow Service, Inc. ("Escrow Agent"), Corvis Corporation ("Depositor") and ▇▇▇▇▇▇▇▇ Communications, Inc. ("Preferred Beneficiary"), who collectively may be referred to in this Agreement as "the parties." A. Depositor and Preferred Beneficiary have entered into a Procurement Agreement dated ________________, 2000 regarding certain proprietary technology of Depositor (referred to in this Agreement as the "Procurement Agreement"). B. Depositor desires to avoid disclosure of its proprietary technology except under certain limited circumstances.

Comm. Platform 8.1.1 -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- JRE/JVM 1.1.7b and 1.1.8 -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Confidential materials omitted and filed separately with the Securities and Exchange Commission. Asterisks denote omissions. ATTACHMENT 12.7 12.6 ESCROW AGREEMENT ---------------- Account Number ______________________ This Agreement is effective _________________, 2000 ______ ("Effective Date") among Fort Know Escrow Service, Inc. _____________________________________ ("Escrow Agent"), Corvis Corporation ("Depositor") and ▇▇▇▇▇▇▇▇ CommunicationsBroadwing Communications Services, Inc. ("Preferred Beneficiary"), who collectively may be referred to in this Agreement as "the parties." A. Depositor and Preferred Beneficiary have entered into a Procurement Agreement dated ________________, 2000 ______ regarding certain proprietary technology of Depositor (referred to in this Agreement as the "Procurement Agreement"). B. Depositor desires to avoid disclosure of its proprietary technology except under certain limited circumstances. C. The availability of the proprietary technology of Depositor is critical to Preferred Beneficiary in the conduct of its business and, therefore, Preferred Beneficiary needs access to the proprietary technology under certain limited circumstances.