... author and rights holder of a contri-bution to grant all users: a free, irrevocable, worldwide, right of access to, and alicense to copy, use, distribute, transmit and display the work publicly and ... difficult to trace. From a user’s perspective,if participation in cultural activities on the internet is to be promoted, it is of greatimportance to secure both access to works and the right to reuse ... this principle of reciprocity to further understanding of copyright as atool for communication between creators and the public and the possible use oftechnology to support free culture on the...