It is not possible to violate their usage from copyright-authorship manner.
It absolutely is possible. I'm not sure why you keep saying that, as global treaties have made copyright and trademark laws uniform across nearly all the globe.
If you made a slightly modified version of their logo then your logo is derived from theirs and similar to theirs. Distributing the derivative logo would violate copyright laws. Using the derivative logo in a product would violate trademark laws. You must either have permission to use it or face the possibility of lawsuit.