For a while I have had an idea for an open source project. Now, I've started building something similar at work as an internal tool (so not public). So does that mean I can not go on and do the personal open source project I had in mind at first? What are the regulations for that? I mean, obviously, I can and would never just copy paste code! But concepts and ideas can be the same in some places.
Can I start this open source project even though I am working on something similar at my workplace which is not open source?