PDF Password Cracker Pro allows to search for "owner"
and "user" passwords with brute-force and dictionary
attacks, effectively optimized for speed. In addition,
it has Key search attack, which guarantees the
decryption (regardless the password length and
complexity) of PDF files that use 40-bit encryption.

The standard security provided by PDF consists of two
different passwords. Owner Password allows to prevent
PDF file from printing, editing (changing), selecting
text and graphics, or adding/changing annotations and
form fields; User Password locks the file so the
password is required to open or view the file. If only
owner password is set, decryption is being done
instantly; decrypted file can be opened in any PDF
viewer (e.g. Adobe Acrobat Reader) without any
restrictions, i.e. with edit/copy/print/annotate
functions enabled. Alternatively, owner password can
be recovered using brute-force or dictionary attacks.

Additionally, PDF Password Cracker Pro supports "key

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