On 08/08/2013 06:31 AM, Rainer M Krug wrote:
Ray Rashif <schivmeis...@gmail.com> writes:
On 8 August 2013 17:51, Rainer M Krug <rai...@krugs.de> wrote:
Just one word of caution: if you can see the text on screen, you can
extract it by taking a screenshot and using ocr (optical character
recognition) and nothing will stop you. So this just makes it slightly
more difficult to get the text.
What's more, if I'm not wrong, encryption depends on the reader having
support, so you can effectively render encryption useless by using a
very old reader and PDF format. Even GhostScript lets you bypass
encryption, though not intentionally.
I might be wrong, but I think even okular had an option (!) to enable or
disable to respect the restrictions.
Yes, that was true at one point. And I assume if one complied the source
oneself, one could pretty easily disable encryption.
Richard
