Password protection of your PDF file ensures that the PDF can only be opened by the intended recipient of the file. Password protection can also be used to prevent users from printing or editing the document. These settings can be further tweaked to allow only low resolution printing, and varying degrees of editing.
To password protect your PDF document in Adobe Acrobat Reader,
- Go to Advanced > Security > Encrypt With Password.
- A prompt will appear asking if you are sure you want to change the security settings.
- Click on Yes.
- Select Encrypt all document contents, check Require password to open document, and enter the password in the “document open password” field.
- If you want control on the permissions to print and edit the document, check Restrict editing and printing.
- Provide the password for changing these settings.
- Make sure Enable copying of text, images, and other content is unchecked.
- Click on OK.
A prompt will appear asking you to confirm the passwords you have entered. Another prompt states clearly that not all third-party programs respect the security settings in the PDF file. In this way you can lock or password protect your PDF file to ensure security and prevent unauthorized editing.
Also check out our article on how to crack or remove this security of PDF files or documents using third party software..
How to Unlock PDF Files Easily for Free
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Yeah, this doesn’t help at all!
a Very misleading explanation. This is not about Acrobat Reader, but Acrobat standard.
Acrobat Reader is a tool which only let you to open/read the pdf file.
There is no other option then paying to get the upgrade if you need password protection. Or as I mostly will do: use zip file, there you can encrypt you zipped file.
how to lock the pdf file,please expain step by step
All the bloody buggers are describing a lot but not saying in a nut shell that how to do the same in step by step.