According to OU's Information Security Policy (policy 860), confidential research data includes (but is not limited to) "information related to a forthcoming or pending patent application, grant applications and proposals, information related to human subjects." If you are working with human subjects, your data is confidential and needs to be stored more securely to protect the privacy and confidentiality of your study participants.
Digital confidential data
Physical confidential data
Sharing confidential data
Confidential data must be de-identified prior to sharing publicly (i.e. both direct and indirect identifiers need to be removed).
ICPSR (Inter-university Consortium for Political and Social Research) is an excellent option for sharing confidential data that both has and has not been de-identified.
Preserving and destroying confidential data
After a research project, take steps to preserve confidential data in a secure, controlled-access environment. De-identified data can be preserved in a data repository. To destroy confidential data, work with your departmental IT to ensure that these files are deleted from your storage media.