Please explain. I select the text, right click, and select Encrypt
>>2. The native encryption from office or pdf documents is not secure.
This is the first I've heard of this. Please explain
From https://en.m.wikipedia.org/wiki/Microsoft_Office_password_protection
Microsoft Office password protection is a security feature to protect Microsoft Office (Word, Excel, PowerPoint) documents with a user-provided password. As of Office 2007, this uses strong encryption; earlier versions used weaker systems and are not considered secure.
The 128-bit key AES protection employed in newer Office 2007–2010 remains secure.