The technology, called eTrust Cleanup, could help IT departments cope with the increased complexity of identity and access management.
Spending in this area is being driven by commercial security needs, government and compliance regulations, consumer privacy and internet-based hacking.
"When it comes to securing corporate information, deprovisioning of access rights is as critical as provisioning," said Toby Weiss, CA senior vice-president of eTrust security management.
Meta Group analyst Earl Perkins said firms typically assign an average of 16 IDs to staff during their employment, but that only 10 of those IDs were removed when they left the company.
Unused, obsolete and excessive user IDs can also accumulate as a result of changes in employee responsibilities, one-time access requests and the hiring of consultants and contractors, he added.