Protecting Metadata of Access Indicator and Region of Interests for Image Files

Algorithm 1

	<Policy xmlns = “urn:oasis:names:tc:XACML:3.0:core:schema:wd-17”
	xmlns:xsi = “http://www.w3.org/2001/XMLSchema-instance”
	PolicyId = “urn:isdcm:policyid:1”
	RuleCombiningAlgId = “urn:oasis:names:tc:XACML:1.0:rule-combining-algorithm:first-applicable”
	Version = “1.0”
	xsi:schemaLocation = “urn:oasis:names:tc:XACML:3.0:core:schema:wd-17
	http://docs.oasis-open.org/XACML/3.0/XACML-core-v3-schema-wd-17.xsd”>
	<Description> Desert.jpg </Description>
	<Rule Effect = “Permit” RuleId = “urn:oasis:names:tc:XACML:2.0:ejemplo:Desert”>
	<Description> Any user can view urn:mimage:Desert.jpg before the end of the year 2019 </Description>
	……
	<!--resource-->
	<Match MatchId = “urn:oasis:names:tc:XACML:1.0:function:regexp-string-match”>
	<AttributeValue
	DataType = “http://www.w3.org/2001/XMLSchema#string”> urn:mimage:Sample.jpg </AttributeValue>
	<AttributeDesignator
	AttributeId = “urn:oasis:names:tc:XACML:1.0:resource:resource-id”
	Category = “urn:oasis:names:tc:XACML:3.0:attribute-category:resource”
	DataType = “http://www.w3.org/2001/XMLSchema#string” MustBePresent = “false”/>
	</Match>
	……
	<!--action-->
	<Match MatchId = “urn:oasis:names:tc:XACML:1.0:function:string-equal”>
	<AttributeValue
	DataType = “http://www.w3.org/2001/XMLSchema#string”>
	View </AttributeValue>
	<AttributeDesignator
	AttributeId = “urn:oasis:names:tc:XACML:1.0:action:action-id”
	Category = “urn:oasis:names:tc:XACML:3.0:attribute-category:action”
	DataType = “http://www.w3.org/2001/XMLSchema#string”
	MustBePresent = “false”/>
	</Match>
	……
	<Condition>
	<Apply FunctionId = “urn:oasis:names:tc:XACML:1.0:function:date-less-than-or-equal”>
	<Apply FunctionId = “urn:oasis:names:tc:XACML:1.0:function:date-one-and-only”>
	<AttributeDesignator AttributeId = “accessDate”
	Category = “urn:oasis:names:tc:XACML:3.0:date”
	DataType = “http://www.w3.org/2001/XMLSchema#date” MustBePresent = “false”/> </Apply>
	<AttributeValue DataType = “http://www.w3.org/2001/XMLSchema#date”> 2019-12-31 </AttributeValue>
	</Apply>
	</Condition>
	……
	</policy>