Unrecognized characters from PDF metadata about pdf-metadata-editor

[zaro]

The metadata indeed contains invalid XML Entities :

This is the raw XML metadata from the document( you can see it foe yourself by opening the PDF with text editor, and look around line 45):

<x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='XMP toolkit 2.9.1-13, framework 1.6'> <rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' xmlns:iX='http://ns.adobe.com/iX/1.0/'> <rdf:Description rdf:about='c9784ce1-aef7-11e6-0000-ef37108bddb&#1;8?&#13;&#4;2016-11-17T09:02:49+01:00&apos; &#16;-L&#13;&#4;,&#2;@&#16;&#4;' xmlns:pdf='http://ns.adobe.com/pdf/1.3/'><pdf:Producer>GPL Ghostscript 9.04</pdf:Producer> <pdf:Keywords>()</pdf:Keywords> </rdf:Description> <rdf:Description rdf:about='c9784ce1-aef7-11e6-0000-ef37108bddb&#1;8?&#13;&#4;2016-11-17T09:02:49+01:00&apos; &#16;-L&#13;&#4;,&#2;@&#16;&#4;' xmlns:xmp='http://ns.adobe.com/xap/1.0/'><xmp:ModifyDate>2016-11-17T09:02:49+01:00</xmp:ModifyDate> <xmp:CreateDate>2016-11-17T09:02:49+01:00</xmp:CreateDate> <xmp:CreatorTool>PDFCreator Version 1.2.3</xmp:CreatorTool></rdf:Description> <rdf:Description rdf:about='c9784ce1-aef7-11e6-0000-ef37108bddb&#1;8?&#13;&#4;2016-11-17T09:02:49+01:00' xmlns:xapMM='http://ns.adobe.com/xap/1.0/mm/' xapMM:DocumentID='uuid:c9784ce1-aef7-11e6-0000-ef37108bddb&#129;v;&#159;�c&#31;&#16;'/> <rdf:Description rdf:about='c9784ce1-aef7-11e6-0000-ef37108bddb&#1;8?&#13;&#4;2016-11-17T09:02:49+01:00' xmlns:dc='http://purl.org/dc/elements/1.1/' dc:format='application/pdf'><dc:title><rdf:Alt><rdf:li xml:lang='x-default'>Title</rdf:li></rdf:Alt></dc:title><dc:creator><rdf:Seq><rdf:li>Windows</rdf:li></rdf:Seq></dc:creator><dc:description><rdf:Seq><rdf:li>()</rdf:li></rdf:Seq></dc:description></rdf:Description> </rdf:RDF> </x:xmpmeta>
You can check it with an XML validator, entities like $#1; are not valid.
So to me the problem seem to be the tool that generated this PDF.