Please pay your forefathers for each word you use, each thought you have and even each invention you make for their share of what you reused. As a first line a

Please pay your forefathers for each word you use, each thought you have and even each invention you make for their share of what you reused. As a first line argument: It's not that you are owed anything (as tshaddox says, it only applies to things already shared/published), it's that you do not owe a due to others. As a second line, I would say that yes, if you are making money off of things you share, then society deserves the right to freely use and share it (say after 20y), even if you put DRM on it (shouldn't be a thing) and even if you didn't originally publish the source code or manuals and tools. Though compulsory requirements should probably be limited as a fraction of sales.