Thorsten Hodes wrote:
> Hello!
>
> I have an encrypted PDF File that was generated with OpenOffice and there
> included encryption-sets.
> Then I would like to modify this "exists" and "encrypted" pdf with iText.
>
> I wrote a small java program that stamped an "OverText" to all included
> pages. But if I do so, I lost the encryption settings from OpenOffice
> for this PDF. How can I fix this? I don't want to lose the openoffice -
> encryption settings...
>
> Can anybody help me?
>
> Here is my small code example...
>
> ...
> ...
>
> System.out.println("Add watermark(s) now!");
> try {
> // we create a reader for a certain document
> String ownerPW = "PW";
> PdfReader reader = new PdfReader("infile-raw.pdf",
> ownerPW.getBytes()); //this is the original pdf - infile that is encrypted
> with openoffice
>
> int n = reader.getNumberOfPages();
>
> // we create a stamper that will copy the document to a new file
> PdfStamper stamp = new PdfStamper(reader, new
> FileOutputStream("infile-sec.pdf"));
>
> // adding content to each page
> int i = 0;
> PdfContentByte over_txt;
> BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,
> BaseFont.WINANSI, BaseFont.EMBEDDED);
>
> while (i < n) {
> i++;
>
> PdfReader reader_pagesize = stamp.getReader();
> float PageSizeHeight =
> reader_pagesize.getPageSize(i).getHeight() / 2;
> float PageSizeWidth = reader_pagesize.getPageSize(i).getWidth()
> / 2;
>
> // demo text over the existing page
> over_txt = stamp.getOverContent(i);
> over_txt.beginText();
> over_txt.setFontAndSize(bf, 48);
> over_txt.setRGBColorFill(255,0,0);
> over_txt.showTextAligned(Element.ALIGN_CENTER,"DEMOMODE",
> PageSizeWidth, PageSizeHeight, 45);
> over_txt.endText();
> }
> // closing PdfStamper will generate the new PDF file
> stamp.close();
> }
> catch (Exception de) {
> de.printStackTrace();
> }
>
> ...
> ...
>
> infile-sec.pdf is the new stamped pdf, but if I open it I lost all encryption
> informations...
You know the owwner password: ownerPW.getBytes()
If you don't know the user password, you can compute it with
PdfReader.computeUserPassword()
You can also get the value for the permissions with
PdfReader.getPermissions();
Use this information with PdfStamper.setEncryption();
br,
Bruno
Now you can
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