PDFBOX-5305: remove check for filters, as suggested by mkl per TECHNICAL CORRIGENDUM 2 which requests this only for catalog metadata xmp

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1894487 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

preflight/src/main/java/org/apache/pdfbox/preflight/font/descriptor/FontDescriptorHelper.java

@@ -28,7 +28,6 @@
 import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_METADATA_FORMAT_UNKNOWN;
 import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_METADATA_FORMAT_XPACKET;
 import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_METADATA_UNKNOWN_VALUETYPE;
-import static org.apache.pdfbox.preflight.PreflightConstants.ERROR_SYNTAX_STREAM_INVALID_FILTER;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -217,14 +216,6 @@ protected void checkFontFileMetaData(PDFontDescriptor fontDescriptor, PDStream f
 
             if (metadata != null)
             {
-                // Filters are forbidden in a XMP stream
-                if (!metadata.getFilters().isEmpty())
-                {
-                    this.fContainer.push(new ValidationError(ERROR_SYNTAX_STREAM_INVALID_FILTER,
-                            this.font.getName() + ": Filter specified in font file metadata dictionary"));
-                    return;
-                }
-
                 byte[] mdAsBytes = getMetaDataStreamAsBytes(metadata);
 
                 try