A resource may be published and widely available yet still subject to access restrictions within a digital repository (SHERPA/RoMEO maintains an extensive database of the copyright and self-archiving policies of publishers). For example, a publisher may place restrictions on accessing a post-print in an institutional repository to subscribers to the journal in which it was included . This is analogous to a library allowing its members to access online journals to which it has subscribed; however, the situation is more complex, as the resources are scattered in IRs and not grouped according to publishers’ access regimes (in a conventional library situation they are grouped within journals). An IR can not be expected to manage information about which institutions have access to a particular journal.
It may be possible to support this sort of scenario by using the eduPersonEntitlement attribute – the value of this attribute must be a URI indicating a (set of) right(s) to a particular resource. To be useful in a federated environment, however, the appropriate values would have to be agreed at a federation level, otherwise such an SP would have to negotiate bilateral agreements with all its subscriber IdPs individually to get the extra attributes, which is possible but probably impractical. A way of avoiding this would be for JISC to negotiate standard entitlements at a national level to enable repositories to share material, by including T&Cs for (e.g.) NESLI (National e-Journals Initiative) material. Currently, JANET makes no statements about any standard values for eduPersonEntitlement.