By default, the materials on this site are made available under an Attribution-NonCommercial-NoDerivatives Creative Commons Licence, unless expressly stated otherwise. This particularly applies to preprints of papers that have been published here. To them the Licence as described by Roger Clark in his A proposal for an open content licence for research paper (Pr)ePrints, First Monday, volume 10, number 8 (August 2005) applies. This Licence is identitical to the Attribution-NonCommercial-NoDerivatives Creative Commons Licence with the exception thatit permits any modifications technically necessary in order to reproduce the work in other media and formats. Clark views this as ... a practical matter rather than one of principle and claims that it can be seen as an enhancement to the [Creative Commons] specification.