Rtistic Appropriation, Copyright and Creativity

Subject: Intellectual Property
Topic: Copyright issues for appropriation artists.
Question 1: Are collage and appropriation in visual arts stifled by the modern interpretation of copyright?
These practices are nothing new in the art industry. They have been around for a long time. Picasso, Dali or Warhol did also use collage and artistic appropriation. In recent times and, in my opinion, due to the increase in financial value of modern art, copyright has become more restrictive with artists appropriating other artistas works.
This study aims to find out why this more restrictive approach to the application of copyright laws has had an impact on the freedom of creativity and how this practice can survive in the technological age. What rules should apply and how to get away using other artistas works.

I would like you to include as sources these two books.

Pedley, Paul, Digital Copyright, 2005

Davies, Gillian, Artists, Photographers and Designers, 2010