Depending on what you are thinking of, it could be titled in one of the following ways:
Intellectual Property Policy
As the work done by employees is likely to be classified as a "trade secret", or "intellectual property" of the company, employees should be able to:
- Recognize what IP belongs to the company.
- Understand that IP of the company shouldn't be shared unless it's required (ex. manufacturing).
- Respect the IP of other companies and holders.
Copyright and Intellectual Property Policy
Very much of the same thing, but extending further into the realm of copyrighted works, such as books, papers, magazines, video, and so on.
Operational Data Policy
This might be what you are looking for, as data used for day to day operations could be classified as a "code base" or repository, as well as data gathered from clients.
Data Retention Policy
Acceptable Usage Policy
I figured I should add this one in, as it is the over arching name for such a policy. It should lay out how corporate computing and information resources should be used by employees, and who is authorized, and who is not. There is an extensive list and examples online for this type of policy.