# Package org.apache.poi.poifs.crypt.dsig.services

- Interface Summary
  Interface | Description
  --- | ---
  RevocationDataService | Interface for a service that retrieves revocation data about some given certificate chain.
  SignaturePolicyService | Interface for the signature policy service.
  TimeStampService | Interface for a time-stamp service.
  TimeStampServiceValidator | Interface for trust validator of a TSP.

- Class Summary
  Class | Description
  --- | ---
  RelationshipTransformService | JSR105 implementation of the RelationshipTransform transformation.
  RelationshipTransformService.RelationshipTransformParameterSpec | Relationship Transform parameter specification class.
  RevocationData | Container class for PKI revocation data.
  TSPTimeStampService | A TSP time-stamp service implementation.

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