Since PDF was create in 1993 by Adobe System, it becomes more and more popular and finally used as an oepn standard for document exchange and long-term archive. What makes PDF so wonderful that it becomes one of the most important and popular file format in a lot of work industries. Among the most amazing PDF features, I think PDF's high security is the main reason why people prefer PDF. Users can set PDF password to protect their PDF files from copying, printing or editing. There are two PDF password types - owner password and user password you can set to protect PDF files.
To increase document security, you can limit access and protect PDF files by creating passwords and restricting certain features, for example, you can set owner password by prevent from copying, printing and modifying.
Below are some tips on how to set PDF password to protect PDF files.
a. Select Secure from Toolbar and click on Restrict Opening and Editing. You can also Encrypt for Certain Identities Using Certificates...
b. Set open password. Click the check box on Require a password to open the document and enter an open
password if you want to restrict others from opening the PDF (users need to type the correct password before opening the document).
c. Set owner passwrod. Click the check boxes on Permissions and enter the permissions password ( or owner password, and users have to provide a right
password before changing security settings). You can also set restrictions of Printing Allowed and Changes Allowed in the Permissionis filed.
d. Click OK to complete the process to set PDF password
This tutorial to set PDF password is for Adobe Acrobat, however, not every one affords to this expensive office software. Actually, it's much easier to set PDF password with a simple PDF creator tool when you convert printable files to PDF and you don't need to use an expensive and complicated Adobe Acrobat.
