java 使用 pdfbox 从 pdf 中删除加密，例如 qpdf
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remove encryption from pdf with pdfbox, like qpdf
提问by Josh Nankin
With qpdf, you can simply remove restrictions/encryption from a pdf like so:
使用 qpdf，您可以简单地从 pdf 中删除限制/加密，如下所示：
qpdf --decrypt infile outfile
I would like to do the same thing with PDFBox in Java:
我想用 Java 中的 PDFBox 做同样的事情：
PDDocument doc = PDDocument.load(inputFilename);
if( doc.isEncrypted() )
{
//remove the encryption to alter the document
}
I've tried this with StandardDecryptionMaterial, but I have no idea what the owner password is. How does qpdf do this?
我已经用 StandardDecryptionMaterial 尝试过这个，但我不知道所有者密码是什么。qpdf 如何做到这一点？
Sample document: https://issues.apache.org/jira/secure/attachment/12514714/in.pdf
示例文档：https: //issues.apache.org/jira/secure/attachment/12514714/in.pdf
回答by Josh Nankin
This is what you'd need to do. Inspired from the PDFBox WriteDecodedDoc tool. You may have to include the bouncycastle jar (http://www.bouncycastle.org/latest_releases.html)
这就是你需要做的。灵感来自 PDFBox WriteDecodedDoc 工具。您可能必须包含 bouncycastle jar ( http://www.bouncycastle.org/latest_releases.html)
if (doc.isEncrypted()) {
try {
doc.decrypt("");
doc.setAllSecurityToBeRemoved(true);
}
catch (Exception e) {
throw new Exception("The document is encrypted, and we can't decrypt it.", e);
}
}
