Copyright and licensing are becoming more complex in the world of academic publishing.
Creative Commons licences are becoming increasingly more popular for Open Access works and are a requirement by several funding bodies. These licences allow authors to decide how their work (articles, conferences, monographs, data, artwork, for example) may be shared.
Many publishers, such as Elsevier, request a specific type of licence in their copyright paperwork (when a paper gets submitted), so it is important to be aware of the differences.
You might also like to have a look at these articles (1 and 2) about the complexities of copyright and self-archiving (i.e. submitting articles to BURO or other repositories). The author, Elizabeth Gadd, is an expert in this field. The conclusions from these studies are that most academics are happy to share their work and that copyright legislation and restrictions imposed by publishers are sometimes in excess of what researchers need.