IESIS - Institution of Engineers and Shipbuilders in Scotland - are seeking to create a digital library of several hundred pdfs and potentially other file types.
Most of the pdfs are to only be read and download accessible to members of IESIS, with a small number of sample pdfs made available to everyone. There would also potentially be a feature for non-members to pay for individual pdfs.
Does Omeka have a permissions system to limit file access in this way? Is it allowed, under the terms of the licence, to charge for pdfs?