在iText中使用setEncryption方法时是否可以仅设置所有者密码？

Question

Is it possible to set owner password as some value and user password as null or empty while using set encryption method of PdfWriter class?

I tried using code something like this

 String OWNER = "test";
 PdfWriter.setEncryption(null,OWNER.getBytes(),
                        PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128);

I am able to open PDF generated with this code without entering any password. BUT when I try to open it for editing with Adobe Acrobat, it opens the document in view mode and throws an error "This is secured document. Editing is not permitted." Screenshot of error: http://dropbox.com/s/1ef551o1z0n9ug1/editerror.jpg

Any idea why this must be occurring? Am I doing something wrong?

On an additional note,

I have generated this new document with

PdfWriter.setEncryption("test1".getBytes(),"test".getBytes(), 
                        PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128); 

Link: http://dropbox.com/s/8jeia7ezervrz18/Test_Success.pdf

I am able to view it after entering password as "test1" and able to edit it with password "test". I am not sure what exactly is going wrong when I pass USER as null in earlier case.

I am using following set of jars in my project

• itext-2.1.7.jar
• bcmail-jdk14.jar
• bcprov-jdk14.jar

Answer 1

    private static String user = "";
    private static String admin = "ADMIN";      
writer.setEncryption(admin.getBytes(), user.getBytes(),
                PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128);

By using the above approach you can set admin password. There might be some problem in your classpath setting. Use Mavel on Gardle for dependencies