Legacy Codebases (COBOL, Java, .NET…) as AI training data
Code written in COBOL, PL/I, RPG, Java EE, VB6 or .NET Framework still runs payroll, banking, insurance and logistics systems, yet very little of it is public. That gap makes it hard for AI models to help with maintenance and migration. If your company owns such a codebase, Momentra can assess whether it could become a licensed training data asset.
Can Legacy Codebases (COBOL, Java, .NET…) be used as AI training data?
Legacy codebases in COBOL, Java EE, VB6 or .NET Framework can be valuable AI training data because so little of this code is public. COBOL programs with copybooks and JCL, stored procedures, and migration projects showing old and new logic side by side matter most. Only code you own qualifies, and hard-coded account numbers and passwords are removed.
No files needed upfront. We sign an NDA before reviewing any sample.
What can be included
You choose the scope. These are the parts of Legacy Codebases (COBOL, Java, .NET…) that are typically most useful.
- ✓COBOL programs, copybooks and JCL job streams from mainframe environments
- ✓Java EE / J2EE applications with EJBs, XML deployment descriptors and Ant or Maven builds
- ✓.NET Framework, VB6 or classic ASP code with Web Forms and WCF services
- ✓Stored procedures, PL/SQL packages and database schemas the code depends on
- ✓Migration projects showing old and new versions of the same logic side by side
- ✓Runbooks, change tickets and maintenance notes kept for older systems
Why AI labs value it
Under-represented languages
Public code repositories contain comparatively little production COBOL, RPG or JCL. Real, working programs in these languages help models understand syntax and conventions they rarely see.
Before-and-after migrations
If you rewrote a COBOL batch job in Java, or moved Web Forms to ASP.NET Core, the paired versions are examples of how business logic is preserved across platforms. This is directly relevant to modernization tools.
Business rules embedded in code
Decades-old systems often hold the only precise statement of a company's rules for interest calculations, claims or inventory. Anonymized, those patterns show models how real enterprise logic is written.
How it is scoped, exported and anonymized
Getting code off the mainframe
Source may live in PDS libraries, Endevor or ChangeMan rather than git. Extraction into plain files, with member names and version history kept where possible, is planned with your team after the NDA.
Check who owns the code
Legacy systems are sometimes built by contractors or on licensed vendor packages. Code you do not own, or that was customized from a vendor's product under license, may need permission or must be excluded.
Hard-coded data needs care
Old code often embeds account numbers, test customer records, server names and passwords directly in source or copybooks. These are detected and removed or replaced before any further use.
How a partnership begins
Share Basic Information
Share only your contact, company, industry, and partnership interests—no raw data required.
Initial Value Assessment
We discuss the data type, completeness, scarcity, and the tasks it could support.
Define the NDA and Boundaries
Before reviewing any sample, we define confidentiality, permitted use, retention, and security requirements.
Receive an Offer and Begin the Partnership
We provide a purchase proposal and contract, then support de-identification and secure data transfer.
Frequently asked questions
- Our code has no version control history. Does it still qualify?
- It might. A snapshot of a large, working legacy system can still be useful, especially for scarce languages. History and documentation add value, but they are not the only factor.
- We are retiring the system. Is this a reasonable time to explore licensing?
- Many companies look at it during a decommission or migration, since the code is being archived anyway. You still decide what is in scope, and nothing moves until an NDA and agreement are in place.
- Do you need documentation, or just code?
- Code alone can qualify, but specs, runbooks and change records help explain what the code is supposed to do. That context makes a dataset more complete.
- Is selling legacy code legal for a regulated company?
- That depends on your contracts, regulators and the data involved. Momentra is not a law firm and this is not legal advice. Your own counsel should review the scope and agreement.
Related
Let's talk about your Legacy Codebases (COBOL, Java, .NET…).
Share only the essential details. No files are required at this stage.
Contact the Momentra team