A partner who helped build your brand, write your software or design your product now plans to leave, and the question of who controls those assets surfaces quickly. The answer depends less on who contributed the most and more on who created each asset and what your written agreements state.
Understanding that distinction before a departure can help you safeguard what your business built.
Creators generally keep what they create without a signed transfer
Under federal law, a creator owns a copyrighted work unless it qualifies as a work made for hire or the creator transfers it in writing. Employee work within the scope of employment qualifies, but courts rarely treat equity partners and members, who control operations, as common-law employees.
A commissioned work by a non-employee qualifies only if it falls within a listed statutory category and both parties sign a written agreement, and custom software generally falls outside those categories. Without a signed assignment, title to code and creative works stays with your departing partner.
Patent rights vest initially in the inventor, so without an assignment, your business has at most a limited, non-transferable shop right.
Partnership funding may not transfer copyright or patent ownership
California generally treats property bought with partnership assets as belonging to the partnership, even when a partner’s name is on the title. That rule does not control who owns copyrights and patents, because federal law decides who holds legal title to them.
Under federal law, paying for development does not transfer ownership unless the creator signs a written transfer. A partner who created the work may therefore keep legal title even though the partnership paid for it.
At best, payment may give your business a limited right to keep using the work, or a defense if your partner objects. Without a signed assignment, your business may be unable to stop others from using the asset or to sell it.
Trade secrets and brand names generally stay with the business
A trade secret stays protected only if your business takes reasonable steps to keep it secret. A departing partner who owed you fiduciary duties of loyalty generally may not improperly take or use that information under California law.
California also strongly protects the freedom to compete. A departing partner can therefore freely compete using general industry knowledge, unless a sale-of-business exception applies. Trademark rights, by contrast, generally belong to the first business to use a mark in commerce, not to the person who came up with the name.
An attorney may help you secure ownership of what the business built
Missing assignments, undocumented contributions and unclear partnership terms can leave ownership contested, even when your business funded the work.
A California business attorney may help you review agreements, confirm who holds title to each asset and document transfers before disputes harden. Clarifying ownership while the relationship is still cooperative may cost far less than litigating it afterward.