Gets or sets a value indicating whether metadata streams are encrypted. The default is true; with
false, a metadata stream stays readable to tools that index files without a certificate.
public bool EncryptMetadata { get; set; }
ISO 32000-2 §7.6.5.3 step c, Table 27 (EncryptMetadata in the crypt filter StmF names). Unencrypted metadata
streams are also left uncompressed.