CEF offers a free service package that gets you started with the Digital Signature Services (DSS) software library maintained by the CEF eSignature building block. It includes services, documentation and tools.
Resources for Trusted Lists Scheme Operators can be found here.
Generic terms and conditions, that apply to all services offered by the CEF Building Blocks, are defined in the Master Service Arrangement (MSA). Specific Service Level Agreements (SLA) can apply to individual services.