Kód: Vybrať všetko
8 miestne
veľké písmená
malé písmená
všetky čísla
všetky špec.symbolyĎakujem
Kód: Vybrať všetko
8 miestne
veľké písmená
malé písmená
všetky čísla
všetky špec.symboly
V Adobe proste nie su blbi a vedia ako to zabezpecitThe two different types of passwords used in PDF files are, and will always be, a source of confusion.
The OWNER PASSWORD is used to control what you can do with/to the PDF file, but you do not have to know it in order to open and view the file. If the owner password is in play, looking at the document’s security properties will tell you what you can’t do. With the right software or a website such has http://www.pdfunlock.com, the owner password can be removed instantly.
The USER PASSWORD on the other hand, is only used to prevent anyone who doesn’t know it from opening and viewing the file. A user password, if not known, cannot be removed instantly.
If the password is not known, our options to help you are very limited. First, the strength and type of the encryption needs to be evaluated. Passwords of the oldest type, also known as RC4 40bit, can always be removed. This is an operation that requires lots of computing power, but is always within reasonable limits.
Removing user passwords that utilize newer encryption, such as 128bit RC4 or AES (128bit or 256bit) is different. It’s fair to say that there are no guarantees that, with currently modern computers, such a password would ever be removed. There are simply too many possibilities. The key here becomes knowing something about the password, and using that knowledge to somehow limit the passwords that are attempted.