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Ton of PDF DeDRM updates

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- Support "Standard" and "Adobe.APS" encryptions
- Support decrypting with owner password instead of user password
- New function to return encryption filter name
- Support for V=5, R=5 and R=6 PDF files
- Support for AES256-encrypted PDF files
- Disable broken cross-reference streams in output
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NoDRM
2021-12-27 10:45:12 +01:00
parent 23a454205a
commit fbe9b5ea89
6 changed files with 513 additions and 77 deletions
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DeDRM_plugin/DeDRM_PDF passphrase_Help.htm Normal file
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Managing PDF passwords</title>
<style type="text/css">
span.version {font-size: 50%}
span.bold {font-weight: bold}
h3 {margin-bottom: 0}
p {margin-top: 0}
li {margin-top: 0.5em}
</style>
</head>
<body>
<h1>Managing PDF passwords</h1>
<p>PDF files can be protected with a password / passphrase that will be required to open the PDF file. Enter your passphrases in the plugin settings to have the plugin automatically remove this encryption / restriction from PDF files you import. </p>
<h3>Entering a passphrase:</h3>
<p>On the right-hand side of the plugin’s customization dialog, you will see a button with an icon that looks like a green plus sign (+). Clicking this button will open a new dialog for entering a new passphrase.</p>
<p>Just enter your passphrase for the PDF file, then click the OK button to save the passphrase. </p>
<h3>Deleting a passphrase:</h3>
<p>On the right-hand side of the plugin’s customization dialog, you will see a button with an icon that looks like a red "X". Clicking this button will delete the highlighted passphrase from the list. You will be prompted once to be sure that’s what you truly mean to do. Once gone, it’s permanently gone.</p>
<p>Once done entering/deleting passphrases, click Close to exit the customization dialogue. Your changes will only be saved permanently when you click OK in the main configuration dialog.</p>
</body>
</html>