How to password protect a folder in Windows 10, to keep your files safe from prying eyes

You can password protect a folder in Windows 10 using a program called WinRar, which is free to download and use.
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You Can Send a Password-Protected File Without Buying Software—Here’s How

You don't have to spend a cent to secure your documents and other important data. Use trusted free apps to lock everything down and send it safely to anyone. If you want to keep your files private, ...

How to password protect a PDF in Adobe Acrobat Reader and shield your sensitive data

To password protect a PDF in Adobe Acrobat Reader, you'll need the paid Pro version, which starts at $14.99 a month.
PC Magazine

Abobe Acrobat Pro Too Expensive? Here's How I Password Protect PDFs (For Free)

Don't let your sensitive data fall into the wrong hands. These tools encrypt important PDFs without the need to spend hundreds of dollars on the full Adobe Acrobat program. At some point you’ll likely ...