Vitalik Buterin: Although I have always supported permissive licenses, I am now more focused on Copyleft.

[Vitalik Buterin: Although I have always supported permissive licenses, I am now more focused on Copyleft] Ethereum co-founder Vitalik Buterin wrote an article titled "Why I used to prefer permissive licenses and now favor copyleft," in which he pointed out that he has always supported permissive licenses, hoping to maximize the adoption and dissemination of works. Publishing under a permissive license helps achieve this because it clearly states that if anyone wants to develop based on my work, they do not have to worry about any issues. Additionally, from a philosophical perspective, he does not like copyright, but appreciates the leftist ideology of 'using copyright against itself.' However, this idea has now shifted, with a greater focus on Copyleft, as open source has become mainstream, making it more feasible for companies to move towards open source. Companies like Google, Microsoft, and Huawei are embracing open source, and the competition in the crypto assets field is becoming increasingly fierce, driven purely by profit. (Note: Copyleft is a concept and licensing method that contrasts with traditional copyright. Copyleft licensing requires that derivative works based on the original work must also be open source and available under the same licensing terms, ensuring that the work maintains its open and shared characteristics during its dissemination and development.)