Kakao Games Prevails as Korean Court Finds Lineage2M Mechanics Not Copyrightable

A South Korean appeals court has upheld a ruling in favor of Kakao Games in a copyright case brought by NCSoft over Lineage2M. The court said that game rules and systems are not protectable as copyright, and NCSoft’s claim of infringement was rejected. NCSoft said it will appeal to the Supreme Court for another review.

NCSoft had argued that Kakao Games’ ArcheAge War copied key elements of Lineage2M, including the user interface, character progression mechanics, and convenience features. Specifically cited were the job-based limits on weapons and skills, a four-class synthesis system of the same tier, a class collection system, a particular daily quest reward structure, a character-mentality system, and the general layout of settings and screens.

The court’s decision reiterated that these elements are not eligible for copyright protection because they constitute “ideas” rather than protectable expressions. It found that Lineage2M did not exhibit a sufficiently distinctive creative character to qualify as an original work separate from prior games.

Additionally, the court rejected NCSoft’s claim of unfair competition. The panel determined that some scenario components, characters, items, and user interface elements are in the public domain or freely usable, and that common rules and progressions in MMORPGs fall outside exclusive ownership by any single company.

The ruling comes after a broader debate in Korea about where the line lies between genre-standard game mechanics and the original creative expressions that copyright aims to protect. In a related context, NCSoft previously secured partial recognition of anti-competitive violations in a separate dispute with Webzen over R2M, but this latest case did not find infringement or unfair competition.

Kakao Games said it respects the court’s decision and will focus on maintaining the stable service of ArcheAge War. NCSoft, for its part, stated it would carefully study the verdict and pursue a higher court ruling.

For U.S. readers, the case highlights a familiar legal boundary: in both Korea and many other jurisdictions, core game mechanics and progression systems are generally viewed as ideas, not protectable copyrightable expression. The decision matters for cross-border game development and publishing, influencing how international studios approach IP strategies, licensing, and potential disputes as Korean studios increasingly compete in global markets. It also underscores how courts weigh public-domain elements and common industry practices when assessing alleged infringement in a fast-growing, globally connected MMO landscape.