From my personal experience, this really depends. Some employment agreements are stated very widely, so the employer even gets retroactive ownership of things you do in the past; some include copyrights for work you'll do in the future, after employment, in the same domain which can be said to be based on work you've done for the employer; some include all side-work regardless of domain, while you work there; some don't.
From my personal experience, this really depends. Some employment agreements are stated very widely, so the employer even gets retroactive ownership of things you do in the past; some include copyrights for work you'll do in the future, after employment, in the same domain which can be said to be based on work you've done for the employer; some include all side-work regardless of domain, while you work there; some don't.