PTCrypt

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Revision as of 15:53, 15 July 2005 by Bruno (Talk)

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PTCrypt is a Java application created by Helmut Dersch as part of Panorama Tools. It is a tool for encrypting JPEG images to make them viewable by PTViewer only in their original web-page context.

(Note that in the future this page is likely to include tricks for circumventing this particular "Copy Protection" scheme. Please feel free to add any such instructions)

Contents

Install

  • make sure Java is installed on your computer
  • download PTcrypt
  • unpack the zip file and put the PTCrypt.jar where convenient to you

Encrypt

  • Double-Click on PTCrypt.jar
  • Enter the path to the image. Example:
http://www.photopla.net/pano.php?id=78&gui=modern
  • Browse to the file you want to encrypt and click "Open"
  • Enter the new file name. Choose the extension based on the kind of encryption you want (see encryption option below).
  • Important: keep a backup copy of the unencrypted JPG.

Encryption Options

Disclaimer: PTCrypt will make stealing panoramas more difficult but not impossible. All encryption scheme supported by PTCrypt have been broken.

JPC: full path

  • Purpose: prevent stealing. The pano will display only when the applet is displayed in an HTML page at the exact URL entered as path.
  • Advantage: strongest PTCrypt protection.
  • Disadvantage: Can't be used with variables URL (such as those that have GET parameters after the question mark). Can't be used within a Windows file system.
  • Examples when it will not display:
http://www.thieves.com/pano.php?id=78&gui=modern
http://www.photopla.net/pano.php?id=78&gui=antique
C:\downloaded\panorama.jpc

JPB: partial path

  • Purpose: more flexibility than JPC
  • Advantage: will run also from a local file system
  • Disadvantage: easy to steal
  • Example when it will display and should not:
http://www.thieves.com/www.photopla.net/pano.php?id=78&gui=modern

JPA: fixed key

  • Purpose: prevent editing.
  • Advantage: most flexible - can be displayed everywhere
  • Disadvantage: no theft protection
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