One proposition is to adopt the system of citation used with book references. The artist would cite the intellectual property she sampled which would give the original creator the credit, as is common with literature references. As tools for doing so Lawrence Lessig proposed the Creative Commons licenses which demand for instance Attribution without restricting the general use of a creative work. One step further is the Free content movement, which proposes that creative content should be released under free licenses. The Copyright reform movement tries to tackle the problem by cutting for instance the excessively long copyright terms, as it was debated by scholar Rufus Pollock. Other copyright scholars, such as Yochai Benkler and Erez Reuveni, promulgate ideas that are closely related to remix culture. Some scholars argue that the academic and legal institutions must change with the culture towards one that is remix-based. In February 2010 Cato Institute's Julian Sanchez praised the remix activities for its social value, ""for performing social realities"" and remarked that copyright should be evaluated regarding the ""level of control permitted to be exercised over our social realities"". According to Kirby Ferguson in 2011 and his popular TED talk series, everything is a remix, and that all original material builds off of and remixes previously existing material. He argues if all intellectual property is influenced by other pieces of work, copyright laws would be unnecessary. Ferguson described that, the three key elements of creativity — copy, transform, and combine — are the building blocks of all original ideas; building on Pablo Picasso's famous quote "Good artists copy, great artists steal.". In June 2015 a WIPO article named ""Remix Culture and Amateur Creativity: A Copyright Dilemma"" acknowledged the "age of remixing" and the need for a copyright reform. But the culture is not without its critics even going so far in accusations of plagiarism. In his 2006 book "Cult of the Amateur".", Web 2.0 critic Andrew Keen criticizes Free and Read-Write Culture. In 2011 UC Davis professor Thomas W. Joo criticized remix culture for romanticizing free culture while Terry Hart had a similar line of criticism in 2012.