You can password-protect the opening and editing of PDF documents at the time you first distill them (as part of their Security Settings) or at anytime thereafter in Acrobat 6. When you set the security settings, you can choose between two different levels of encryption:
- 40-bit RC4: Used for PDF files created when you set the encryption level to 40-bit RC4 (Acrobat 3.x, 4.x)
- 128-bit RC4: Used when you set the encryption level to 128-bit RC4 (Acrobat 5.x, 6.0)
40-bit RC4 encryption offers a lower level of file security but is compatible with Acrobat 3 and Acrobat 4. 128-bit RC4 offers a higher level of security (it’s a lot harder to hack into) but is compatible only with Acrobat 5 and Acrobat 6. If you’ll be sharing secured PDF documents with coworkers who haven’t yet upgraded to Acrobat 5 or 6, you’ll have to content yourself with the less secure, 40-bit RC4 encryption. However, if you’re dealing with highly sensitive, “for-your-eyes-only” material, you may want to upgrade everybody to Acrobat 6 as soon as possible, so that you can start taking advantage of the
more secure 128-bit RC4 encryption.
2 comments:
Great man ! Thanks for post ! This is really great way of protecting pdf files. It is really very useful thing. Let me try it..Hopefully, I will enjoy this new feature of pdf.
This is a good way to protect pdf files with password.
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