The company I'm currently at is actually really cool about stuff like this, so getting permission shouldn't be a problem. My concern was more the legal aspect, if the startup ever got the point of being considered for VC funding or being acquired. I wouldn't worry about my company taking legal action as much as scaring away investors or a company. I just want to sort out the legal issues before diving in full force...
The company I'm currently at is actually really cool about stuff like this, so getting permission shouldn't be a problem. My concern was more the legal aspect, if the startup ever got the point of being considered for VC funding or being acquired. I wouldn't worry about my company taking legal action as much as scaring away investors or a company. I just want to sort out the legal issues before diving in full force...