Meaning
Compliance failures that arise when proprietary software is combined with copyleft licensed code can result in the involuntary disclosure of valuable trade secrets. Open source taint occurs when developers incorporate open source components with restrictive licensing terms, such as the GNU General Public License, into a proprietary software application. This integration triggers reciprocal obligations that require the company to release its proprietary source code to the public under the same open terms.
Reciprocal Obligation
Restrictive licenses are designed to keep software open by demanding that derivative works also be made open. When a developer includes copyleft libraries in a proprietary project, the open source taint spreads to the entire codebase through compilation or dynamic linking. This means the company cannot license the combined software under a closed, commercial license without violating the terms of the original open source license.
Asset Depreciation
Proprietary software represents a major part of the enterprise value of technology companies. If open source taint is discovered during due diligence before an acquisition, it can reduce the transaction value or cause the deal to collapse. Investors will not pay a premium for software that the company is legally required to distribute for free to competitors.
Compliance Remediation
Resolving license non-compliance requires either rewriting the tainted software or replacing the copyleft components with permissive alternatives. This process is time-consuming and expensive, often requiring the company to suspend product releases while engineers perform code audits to isolate the problematic code. Implementing automated repository scanning tools during the development phase prevents the introduction of copyleft code before it can affect the asset value of the enterprise, saving millions in emergency rewrite costs before a transaction occurs.