Viewable locked pdf files

reposting because I get a notification : It appears you're not allowed to view what you requested. You might contact your administrator if you think this is a mistake
Im reposting this because someone obviously deleted the original post for some odd reason I don't know how. Going back to what GKaiseril mentioned, so whats the best way to secure a  viewable pdf file such that it can't be opened by places like pdfunlock and apps such as inkscape and so on?

It looks like it was moved because of the subject matter (bypassing security). PDF consumers are expected to respect any security restrictions present in a document. If you don't specify a document open password, the document contents can be decrypted without needing to know the password. This is no secret. If you use a document open password of sufficient strength and a high encryption level (e.g., one of the AES types), it will be very difficult to defeat.

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