Creating a password locked pdf document in linux

We can user pdftk tool to create a password locked pdf file i.e. to open the pdf file we need to open the supply a password.

The options that have to be passed to pdftk are

Let us say we have a file temp.pdf and we want to have the password "hello" for opening the file and we will call the new file by the name temp_passwd.pdf

Now if we try to open the file temp_passwd.pdf we will be prompted for a password and the file will open only if we pass the password "hello".

In the command we also use encrypt_128bit instead of encrypt_40bit.

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