Vitalik: I supported loose licensing in the past, but now I am more concerned about copyleft

Odaily Planet Daily News: Ethereum co-founder Vitalik Buterin said in a post that he has always supported permissive licenses because he hopes to maximize the adoption and dissemination of his works, and publishing with permissive licenses will help achieve this because permissive licenses make it clear that if anyone wants to develop based on my work, there is no need to worry about any problems. In addition, he does not like copyright from a philosophical point of view, but appreciates the copyright left-wing concept of "using copyright against itself". However, this idea has now changed, and he has begun to pay more attention to Copyleft, because open source has become mainstream, and it is more feasible to push companies to open source. Companies such as Google, Microsoft and Huawei are embracing open source. Secondly, the competition in the field of cryptocurrency is becoming more and more fierce, and profit is the only thing. (Note: Copyleft is a concept and licensing method that is opposite to traditional copyright. The Copyleft license requires that derivative works based on the original work must also be open source and open in the same licensing method, so that the work can maintain its open and shared characteristics during the dissemination and development process.)