Cory Doctorow argued in a talk given to Microsoft's Research Group at their Redmond offices on June 17, 2004 on copyright, technology and DRM that copyright laws should be liberalized to allow for free sharing of all digital media . He also argues that DRM, claiming that it limits the free sharing of digital media and frequently causes problems for legitimate users (including registration problems that lock users out of their own purchases and prevent them from being able to move their media to other devices and platforms.