-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Peter,
On 3/10/2010 10:37 AM, Peter Crowther wrote: > On 10 March 2010 15:30, János Löbb <janos.l...@yale.edu> wrote: > >> When I use the DVD Player from Apple, I cannot take a screenshot even if I >> click myself to the Finder first. So there is something already in practice >> that prevents from taking a screenshot :-) >> >> Yes - for an application that runs as a process on a particular operating > system, and generates the images within that application. Even then, I > suspect there are ways of scraping the pixels from the video card's frame > buffer. I think the OP is trying to prevent casual "stealing" of the images, or just borrowing them for another site. Just for the sake of mental mast... er, fun! you could write a javascript event handler that watched for un-focus events for the page (which would likely happen if you were using an external utility to take a screenshot) and/or key events for all environments you can think of, and put a big, fat, black rectangle over the images. > However, showing an image from a web server in a web browser does not give > you operating system protection. Yup, and my technique above only works with pages that /you/ control, so if someone links to your images from elsewhere, your images are again stealable. My advice to the OP (which hasn't bothered to comment since the original question, which is kinda irritating) is: 1. Watermark your images 2. Claim copyright on your images 3. Advertise your acceptable use policy for your images 4. Sue anyone who misuses them All technological tricks are bound to take you a lot of time and not cover all possibilities, so just forget it. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuXvs4ACgkQ9CaO5/Lv0PCOZQCgwd3JQYu8YSIxHqUyzG1NJY9K A7wAoL5QVHomZHCYUTOK2HYK6f5EO13D =jUYx -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
