@asciidoctor/core
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    Variable SECURE

    SECURE: number

    A safe mode level that disallows the document from attempting to read files from the file system and including the contents of them into the document, in additional to all the security features of SafeMode.SERVER. For instance, this level disallows use of the include::[] directive and the embedding of binary content (data uri), stylesheets and JavaScripts referenced by the document. (Asciidoctor and trusted extensions may still be allowed to embed trusted content into the document).

    Since Asciidoctor is aiming for wide adoption, this level is the default and is recommended for server deployments.