Remix culture is a term used to describe a society which allows and encourages derivative works. Remix is defined as combining or editing existing materials to produce a new product. A Remix Culture would be, by default, permissive of efforts to improve upon, change, integrate, or otherwise remix the work of copyright holders. In his 2008 book, Remix, Lawrence Lessig presents this as a desirable ideal and argues, among other things, that the health, progress, and wealth creation of a culture is fundamentally tied to this participatory remix process. Generally speaking, remix culture can be defined as the global activity consisting of the creative and efficient exchange of information made possible by digital technologies that is supported by the practice of cut/copy and paste. A remix can be extended, selected or reflective.
The is a documentary film featuring the collaborative remix work of hundreds of people who have contributed to the Open Source Cinema website, helping to create the "world's first open source documentary". Gaylor encourages more people to create their own remixes from this movie, using media available from the Open Source Cinema website, or other websites like YouTube, Flickr, Hulu, or MySpace.
Copyleft is a way of guaranteeing digital freedoms. When programs, software and other work is made totally free without any copywriting at all it is at risk of being modified and redistributed as a proprietary product.

Copyleft says that anyone who changes or modifies programs and software must pass on all the same rights and privilages of freedom to all later users.

To copyleft a program, we first state that it is copyrighted; then we add distribution terms, which are a legal instrument that gives everyone the rights to use, modify, and redistribute the program's code, or any program derived from it, but only if the distribution terms are unchanged. Thus, the code and the freedoms become legally inseparable.

Proprietary software developers use copyright to take away the users' freedom; Copyleft, use copyright to guarantee their freedom. That's why we reverse the name, changing “copyright” into “copyleft.”