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This class defines the attributes that make up a watermark that defines the lifetime of a
document and the version of the signing algorithm used to sign it.
The cryptographically secure signing algorithm that should be used to sign and verify all
parts of a document.
The major version number of the implementation of the notary class used to sign the document.
The major version number changes when version of the notary class is incompatible with
previous versions of the class for doing signing and verification.
The minor version number of the implementation of the notary class used to sign the document.
The minor version number changes when new features are added, or bugs are fixed in
previous versions of the class for doing signing and verification. All minor versions under
the same major version should be compatible.
The date and time that the document was created and became valid.
The date and time that the document will become no longer valid.