An "owner password" can be removed by many commonly available "PDF cracking" software, including some free online services. The owner password does not encrypt the file, and instead relies on client software to respect these restrictions, and is not secure. The user password encrypts the file and requires password cracking to defeat, with difficulty depending on password strength and encryption method. The standard security provided by Acrobat PDF consists of two different methods and two different passwords, user password, which encrypts the file and prevents opening, and owner password, which specifies operations that should be restricted even when the document is decrypted, which can include: printing, copying text and graphics out of the document, modifying the document, or adding or modifying text notes and AcroForm fields. A PDF file may be encrypted for security, or digitally signed for authentication.
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