The conditions of use vary. Contracts generally spell out specific requirements for data use, inspections and penalties, publication of analyses, security, and administrative issues.
The Population Studies Center at the University of Michigan has compiled a of the conditions of use that apply to the retricted access data contracts they have processed for nearly 40 different restricted access sources, as compared with the conditions of use for publicly available data at . This matrix includes links to more detailed information on contract conditions for each source. It can be an invaluable resource for preparing your own security plans and data contracts for approval on this campus, used in conjunction with SSDS' listing of major sources of restricted access data which provides links to datasets descriptions, documentation and forms and guidelines.