At some point in your employment history, you signed a document that transferred ownership of your intellectual work to your employer. This is so common as to be near-universal in knowledge work: the Invention Assignment Agreement, or its variants — the Proprietary Information and Inventions Agreement, the Employee IP Agreement, the IP Assignment Clause embedded in a broader employment contract. You may not remember signing it. You almost certainly did not read it carefully. It is almost certainly still in effect, and depending on its terms and your jurisdiction, it may have implications for work you are doing right now — including work you do at home, on your own equipment, outside of work hours.
The basic structure of these agreements is this: anything you create that is related to your employer's business, that uses the employer's resources, or that was developed in connection with your employment belongs to the employer. The scope of "related to the employer's business" is where the implications become significant. A broadly drafted agreement can capture a startlingly wide range of creative and intellectual work. Software written by a software engineer at home, during evenings, that might conceivably be useful to the employer's business. Blog posts. Research. Systems frameworks. Side projects with even a tenuous connection to the employer's domain.
The doctrine underlying these agreements is called the "work made for hire" doctrine in copyright law. For employee work product created in the scope of employment, copyright vests automatically in the employer under United States copyright law without any agreement being required. The IP assignment agreement typically extends this to inventions and other creative work beyond the strict scope of employment — capturing things that work-for-hire doctrine might not, and requiring the employee to cooperate in filing patents and executing formal assignment documents.
Most people who sign these agreements do so on the same day they sign their non-compete, their handbook acknowledgment, and their direct deposit authorization — all at once, in a packet, with no individual attention given to any of them. This is understandable and nearly universal. It is also potentially expensive, because the IP assignment agreement can affect whether the side project you have been building for two years belongs to you or to your employer, whether the book you wrote is yours to sell, and whether the startup you found after leaving the company is building on intellectual property you actually own.
Carve-outs are the most important part of any IP assignment agreement and are frequently available but rarely requested. Many states — including California, Delaware, Illinois, Minnesota, North Carolina, and Washington — have statutes that limit the scope of IP assignment agreements by prohibiting them from capturing inventions developed entirely on the employee's own time, without employer resources, that are unrelated to the employer's business and do not result from work performed for the employer. In these states, the statutory carve-out exists regardless of what the agreement says; the employer cannot contract around it.
In states without such protections, the employer's protection is only as limited as what the agreement says. In those states, negotiating explicit carve-outs before signing is the only protection available. A specific carve-out schedules ("Schedule A") in which you list existing work and side projects that are excluded from the assignment is the most useful practical tool. An employer who refuses any carve-out whatsoever may be telling you something about how broadly they intend to assert IP ownership.
The practical implications branch in two directions: what the agreement covers going forward, and what it may have covered already. For work you have already created while employed, the question is whether that work falls within the agreement's scope and your employer's interest in it. For most employers, enforcement focus is on commercially significant technology and not on the essay you wrote about urban planning or the photography project you completed on weekends. But "most employers" is not a guarantee, and the agreement you signed may technically capture work that no one intends to enforce against. Understanding the gap between technical coverage and likely enforcement helps calibrate actual risk.
For work you are creating now or plan to create: understand the agreement's scope, maintain clear documentation of work created on personal time without employer resources, avoid any use of employer equipment or networks for personal projects, and where the connection to the employer's business is plausible, get explicit written acknowledgment that the work falls outside the agreement's scope before investing significant time in it. An informal email confirming that a manager is aware of a side project does not provide legal protection, but a formal written exclusion in the employment agreement or a subsequent addendum does.
The moment to negotiate is before signing, not after. When you have a job offer in front of you, you have leverage to ask for modifications to IP assignment scope. You can ask for a Schedule A listing excluded prior inventions. You can ask for a narrower definition of "related to company business." You can ask for explicit carve-outs for creative work in domains unrelated to your job function. Most employers will accommodate reasonable requests from candidates they want to hire. The cost of not asking is years of ambiguity about who owns the work you create.
The IP you signed away may be partially recoverable — through statutory carve-outs, through the employer's disinterest in enforcing against low-commercial-value work, or through negotiation of clearer terms. But the first step is knowing what you signed.