Let's say someone works on personal software projects on their own time while also working for a software company. One day a situation arises such that the source code of one of these personal projects would be very useful within the context of the employee's primary job.

What legal avenues exist for the employee to include the source code in the employer's codebase while also retaining the right to use the source code in future projects of their own?

Let's also say, the employer is based in NY and the employee works from home in MA. And, there's no clause in their job contract that would imply the employer automatically gains the rights to code the employee writes on their own time.

One such avenue would probably be to release the source code as open source under the MIT license, for example. This should work, but presumably will require that the the employer permanently include the MIT license text inside their codebase if the source code needs to be altered to fit their needs.

Are there other ways?

2 Answers 2


I actually did this, some years ago. I was working full-time as a software developer, and had created and published as shareware some file manipulation utilities, not related to the primary business of my then employer. Then a situation arose where the functions of those utilities would be useful to the employer. Since the employer was a sole proprietor, not a large corporation, we came to a simple agreement where the employer licensed the code for $1.00 and I incorporated the code without its interface into the employee's product. From later experience, a corporate employer would probably not have agreed to this, although you never know.

  • Interesting. Something like this might be ideal in that there's no open source license text that needs to be included in the employer's code repo. Why don't you think a corporate employer would go for it?
    – TrogDor
    Jan 7, 2021 at 23:30
  • @TrogDor In my experiences, corporate employers are not willing to negotiate documents prepared or approved by their legal departments, or accept legal documents proposed by employees. Unless the solution were unique, a corp would simply order use of some other solution, perhaps a 3rd party library. But the only way to know is to ask in a particular case. Jan 7, 2021 at 23:46

First it must be established that this is not a work for hire. Since the guy is hired to write code for the company, this is non-trivial, but doable. Since the company has no claim to owning the copyright, the employee can treat his employer just like he would treat any other customer: he would license the use of the code, while retaining copyright. Then it just depends on how he wants his software to be used. You can completely give it away, you can use the MIT license if you like that, or one of the CC licenses; GPL; or write your own. You have to decide what you want to allow or prohibit before you can pick a specific license.

  • Thanks. Can you elaborate on what's required to establish whether this as not a work for hire?
    – TrogDor
    Jan 7, 2021 at 23:28
  • It has to do with what they offer as proof that it is a work for hire, and how you counter-argue. For example, is it "clearly unrelated": you write stats-processing code for work, the home project is digital signal processing. It depends on what agreement you have with them as to the scope of your employment. Will they agree that the product is not work-related? If not, resolving this in court is not the best approach especially for freeware.
    – user6726
    Jan 8, 2021 at 0:23

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .