What are the types of PDF encryption methods?
How to encrypt PDF files? In fact, there are many ways to encrypt, and the key is to see how much you need to encrypt.
For example, I only want to encrypt part of the data, or delete part of the text, or encrypt the entire PDF file so that no one can open it.
Above three angles, I share three kinds of PDF document encryption methods, pdf editor freeshould be the most complete PDF document encryption to share it ~
basic version of encryption technology
PDF document "Ciphertext" function tutorial
Sometimes, you need to share PDF courseware and PDF reports, but you want to make them public and don't want core information to leak out. What should I do?
At this time, we must use the "ciphertext" function of PDF software, whose principle is to hide sensitive information and encrypt it to avoid data leakage.
PDF document encryption function
The following, taking PDF as an example, demonstrates the ciphertext operation method:
Step 1: Install PDF, drag the file directly into a software to open.
Step 2: Mark the encrypted text area as shown below. Click Mark as Encrypted Text under the Protect option.
Step 3: Save the encrypted document. After clicking "Apply ciphertext", you can distribute the encrypted document to others.
Click to view PDF document encryption
In the above step, the method of marking the range is as simple as selecting the text area that you want to mark as ciphertext.
After the completion, the marked regional economy will be covered in black, and other people can no longer view it. The specific teaching effect is shown in the figure below.
Of course, if you don't like black, you can select the area, right click, select Properties, set the Mosaic cover color.
Click to see the PDF encryption effect.
PDF [encrypted text] is characterized by encryption technology, other people can not see the hidden content, can not modify, fully ensure the security of the file.
Second, advanced version encryption methods
PDF document for erasing function design tutorial
If you're uncomfortable with encrypting documents or, as fans say in private messages, want to make PDF documents prettier.
If you want to ensure the beauty of PDF, it is recommended that you use the PDF erase function to directly erase important data and prevent information leakage.
Click to view PDF erase technology features
The operation method of the PDF document erase function is also very simple. Take PDF as an example, long press the mouse, select the area to be erased, click "erase" to erase the information.
Click to view PDF erase technology effect
As you can see from the image above, the erased PDF document is so clean that no one will notice when they read it.
By the way, the box selection function here can not only erase the information, but also copy the selected text into the picture u002Ftext information.
High level encryption method
PDF Document Bulk encryption course
If your PDF document can be large, many management page data need to be covered, at this time for us to Mosaic or erase one by one is too waste a lot of time, it is recommended to use batch Mosaic function.
PDF batch Mosaic function
Under the Protect option, click Search and Mark Ciphertext, and then enter the word you want to mark as ciphertext in the search box, such as Experience.
Click the Search button and the PDF will automatically retrieve all the words about "experience".
Before marking a word as encrypted text, check the box on the left, and then click Apply all encrypted text tags to block all similar words.
Is it easy and fast to follow the above steps?
