APDFPR can recover ( try to recover) this password, too, but time-consuming dictionary and brute-force attacks are required. If one is set, the file is encrypted with strong RC4 algorithm, and cannot be opened at all, if the password or encryption key is not known. However, such decryption possible only if "user" password (see below) is not set or known.Īlso, there are "open" (so-called "user") passwords. If the file is protected this way, you open it in Adobe Acrobat Reader (again, the password is not required for that) and select File | Properties menu item, Security, Show Details, the following information is shown (for example):įortunately, there is no need to recover that password at all: instead, we can remove it (decrypt the file), so the resulting document will not have any restrictions. Protecting document with access restriction ("owner", so-called "security" or "master") password does not affect a user's ability to open and view the PDF file, but prevents user from editing (changing) the file, printing it, selecting text and graphics (and copying them into the Clipboard), adding/changing annotations and form fields etc (in any combination). About PDF encryption ELCOMSOFT.COM » Advanced PDF Password RecoveryĪdobe Acrobat features two levels of password protection.
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