-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Sorry, my last message was actually rejected by the moderation robot (if this is a robot).
Vincent Danjean <vdanjean...@free.fr> writes: > On 19/04/2010 17:32, Merciadri Luca wrote: >> Sjoerd Hardeman wrote: >>> Pdf "anti-features" are fake security. Don't trust on them, never. >> And what do you suggest if one wants some real protection _and_ the >> benefits of a format like PDF? Thanks. > > If you have free software (ie software you have the sources and are able > to recompile) and if you can get the information on the screen, then it is > only a matter of programmation to be able to have it on printer. So, > free software readers that forbid printing can be (more or less) easily > circumvented (and the patch to do this will be done and available on > internet). So why would the authors of such readers want to program this > at first time. > > If you want to avoid printing, you need to fully control the whole chain > (ie TPA, ...) AND the terminals (ie, if you can show it on screen, some > classic 'print-screen-to-file' and graphical software can be used to > print the document, or even camera and image post-processing). > > For now, the only domain where such restrictions works partially are > HD-DVD (and its possible it is already broken). This is possible because > it is expensive to acquire good quality video data (ie recording what > is diffused by a secure HD player on screen by a camera will have > no really good quality). This would not work for audio data (at least, > until the decoder is not embedded into brain ;-) ) because it would > be easy to reacquire good quality data from a line-out. / > > So, what would be the use case to allow a someone to read the information > but not print it ? In any case, printing it would be more or less convenient > but it will always be possible if it is displayed on screen (even > with Acrobat Reader) As I explained before (or in the same thread in linux.debian.user), this is more a management (i.e. human) problem than a technical problem. It sometimes happens that you want to show something but without giving the others the possibility to do what they want with what you show them. I here suppose that the `others' are quite beginners. - -- Merciadri Luca See http://www.student.montefiore.ulg.ac.be/~merciadri/ - -- If you fake it, you can't make it. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Processed by Mailcrypt 3.5.8 <http://mailcrypt.sourceforge.net/> iEYEARECAAYFAkvMwggACgkQM0LLzLt8MhxBxQCfR6BBvGFPzKDpu81yTxoJfyt/ 2okAn11ouCFzaJeEReibHIyOGHGzUc71 =jOZX -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/874oj7181j....@merciadriluca-eee.workgroup
