: Artwork is copyrighted when it is created. It doesn't matter if it is a concept or not, it is still copyrighted. If someone were inclined to try and prove you used the Bactolab logo as

Artwork is copyrighted when it is created. It doesn't matter if it is a concept or not, it is still copyrighted.

If someone were inclined to try and prove you used the Bactolab logo as a basis, they wouldn't have a lot of difficulty.

It definitely appears to be at best derivative work. Which can be an infringement on copyrights.

However, I'm a designer, not an attorney.

The only definite way to know if its "okay" is to consult an attorney specializing in such matters.

Also be aware trademarks and copyrights are not the same thing. Trademarks are about reducing brand confusion in a specific industry, whereas copyrights are about who owns the artwork. Every piece of artwork generally has a copyright holder (barring public domain), but not everything is trademarked.

To the anonymous user continually attempting to edit this answer....

The continued attempted edits to remove the image from this answer makes me question why the image was ever posted in the first place. I've cropped the images sufficiently that they can't be immediately recognized without knowing the original two images. The attempted replacement image does not vary enough to warrant the edits.