Creative Commons license "Share Alike"
This license lets you remix, tweak, and build upon my work even for commercial reasons, as long as you credit me and license your new creations under the identical terms. This license is often compared to open source software licenses. All new works based on yours will carry the same license, so any derivatives will also allow commercial use. Read more about Creative Commons.

A. finds this license the most natural and fruitful way to deal with intellectual property, if this even exists. It comes most close to what we call "Fair Traide". We all get influenced by each other, it's an ongoing exchange. It's an illusion to think, one can own an idea and to protect it: You must stay at home and disconnect from everything or go out and it will probably end in defence and oppression, which is not healthy for anybody. For sure there are great ideas around, which people mixed in their heads, and to get the credit for it, is more than understandable. Sharing information, ideas and credits will produce more communication, more knowledge, greater ideas -yea. Creative commons is a way to deal with it.