Below is the documentation available for V4 of the Shibboleth Identity Provider, including all 4.x patch and minor upgrade releases. Documentation is split into two parts: documentation meant for individuals that are deploying and managing an Identity Provider and documentation meant for individuals that are developing extensions for the Identity Provider.
All software, including archived releases, is available from https://shibboleth.net/downloads/identity-provider/ and each release is accompanied by a detached PGP signature using one of the keys listed in the project's PGP_KEYS file.
All our software is licensed under the Apache 2.0 open source software license.
High-level information to get started with SAML and Shibboleth can be found in the Concepts wiki space.