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https://issues.apache.org/jira/browse/PDFBOX-4308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16602300#comment-16602300
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Tilman Hausherr commented on PDFBOX-4308:
-----------------------------------------
That was a nasty one… until I noticed that the object number in the PDF wasn't
the same than the one in {{COSWriter.visitFromString}}.
Todo next: I'll create a test based on your file.
There will be a snapshot available within the next few hours at
https://repository.apache.org/content/groups/snapshots/org/apache/pdfbox/pdfbox-app/2.0.12-SNAPSHOT/
> PDDocument protect changes color palette
> ----------------------------------------
>
> Key: PDFBOX-4308
> URL: https://issues.apache.org/jira/browse/PDFBOX-4308
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.11
> Reporter: Falko Riemenschneider
> Priority: Major
> Fix For: 2.0.12, 3.0.0 PDFBox
>
> Attachments: Quelldatei.pdf, Zieldatei-mit-Schutz.pdf
>
>
> When applying protection to a PDF the resulting PDF shows weird background
> colors.
> The following minimal sample program produces the observed behaviour in
> attached PDF "Zieldatei-mit-Schutz.pdf"
> {code:java}
> package protecttest;
> // $ java -version
> // openjdk version "1.8.0_181"
> // OpenJDK Runtime Environment (build
> 1.8.0_181-8u181-b13-0ubuntu0.18.04.1-b13)
> // OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)
> // compile with
> // javac -cp pdfbox-2.0.11.jar protecttest/PdfProtector.java
> // execute with
> // java -cp pdfbox-2.0.11.jar:commons-logging-1.1.3.jar:.
> protecttest.PdfProtector
> import java.io.File;
> import org.apache.pdfbox.pdmodel.PDDocument;
> import org.apache.pdfbox.pdmodel.encryption.AccessPermission;
> import org.apache.pdfbox.pdmodel.encryption.StandardProtectionPolicy;
> public class PdfProtector {
> public static void main(String[] args) throws Exception {
> // load and save with no protection
> PDDocument d1 = PDDocument.load(new File("Quelldatei.pdf"));
> d1.save(new File("Zieldatei-ohne-Schutz.pdf"));
> d1.close();
> // everything seems fine with the resulting PDF
> // load and save with protection
> PDDocument d2 = PDDocument.load(new File("Quelldatei.pdf"));
> AccessPermission ap = new AccessPermission();
> ap.setCanAssembleDocument(false);
> ap.setCanModify(false);
> d2.protect(new StandardProtectionPolicy("foobar","",ap));
> d2.save(new File("Zieldatei-mit-Schutz.pdf"));
> d2.close();
> // resulting file is rendered with odd colors
> }
> }
> {code}
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