Is "no source code was copied" still a sufficient copyright defense?

The defense that "no source code was copied" is no longer sufficient on its own to dismiss copyright infringement claims in software litigation. Courts now evaluate a broader range of factors, including non-literal elements and the context of the alleged infringement. Here’s a breakdown of the key considerations:

1. Copyright Protects More Than Literal Code

• ·Non-Literal Copying: Courts recognize infringement even without direct source code copying, focusing on structure, sequence, and organization (SSO) (e.g., Whelan v. Jaslow, Computer Associates v. Altai).
• ·APIs and Interfaces: The Oracle v. Google (2021) ruling confirmed that APIs can be copyrightable, emphasizing that creative expression in software design extends beyond raw code.

2. Substantial Similarity and Legal Tests

• ·Courts apply tests like the abstraction-filtration-comparison method (Computer Associates v. Altai) to assess infringement, examining high-level design, algorithms, and user behavior.
• ·Even with independent development, similarities in functionality or architecture may trigger infringement claims.

3. Independent Creation and Clean Room Design

• ·A robust defense requires documented proof of independent development, such as a clean-room process (isolated teams, no access to original code).
• ·However, clean-room design isn’t foolproof—courts may scrutinize indirect copying or overly similar outcomes.

4. Fair Use and Functional Limitations

• ·Fair use (e.g., Oracle v. Google) can override infringement claims, depending on transformative purpose and the nature of the copied material.
• ·The merger doctrine may negate protection if the expression of an idea is functionally limited to a single method.

Key Takeaways

• ·"No source code was copied" is a starting point, but courts now examine non-literal elements, substantial similarity, and context.
• ·Strengthen your defense with evidence of independent creation, clear design distinctions, and legal arguments addressing APIs/SSO.
• ·Stay updated on evolving precedents, especially in areas like AI-generated code, where traditional boundaries are tested.

For litigation, consult an IP attorney to navigate this nuanced landscape.