A SaaS escrow agreement exists to outline how the software data will be delivered from the software as a service, or SaaS provider. A SaaS Escrow Agreement is a simple tri-party arrangement with mutually agreed terms between the SaaS vendor, customer, and Escode.SaaS Escrow Agreement. When an escrow account is set up, you can authorize individuals to use the money in the account. A source code escrow agreement is a contract between a client and a software developer, ensuring client protection if software maintenance fails. A form of escrow agreement is a legal contract that guarantees a third party will hold the funds or property during an exchange.