Use security groups to limit access to contracts. Organize contracts and users into groups so people can only access certain contract records. Groups can be large or small.
Lextree comes with several user roles to control what people can do with contracts. You can limit users to read-only access so they cannot delete or edit contracts.
Limit document access
You can further control who sees contract information by toggling the documents feature on or off. This would allow some users to view the basic information about the contract without access to the documents themselves.