One time password option
There should be multiple options to password protect a pdf, not just read/edit.
When you make a pdf that is password protected, you have to make sure that whoever you are sending it to, understands how to enter the password, change the password and/or turn off the password. Not everyone uses Acrobat.
To remove a password, you don't have to go into File > Properties and click the “Security” tab. Click the “Security Method” box, select “No Security”, and click “OK” to remove the password.
Not everyone understands Acrobat. When you password protect a pdf, there should be an option to secure a pdf one time, or just to open. When the correct password is entered and the pdf opens, the password information is automatically deleted/removed. The next time you go to open the pdf there is no password. You can always turn it back on, if you know how, but this would be a simple protection if a pdf was sent via email, USB, cloud, …
Not everyone knows and understands Acrobat.
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Shamsudeen s commented
this option is very important for forum website owners and for community websites, it will help them to upload a pdf file and its needed a once time password for a pdf opening, this makes sense