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Is it possible either via .js or flash to silently be alerted when a .pdf is opened? Further is it possible to set (flash) cookies to enable tracking, again with no user notification?
I appreciate tracking only works with an internet connection, and a .pdf reader that supports script execution. This is not intended to be bulletproof.
I am not looking for a DRM solution, just a way to silently track if a .pdf is opened on more than 1 PC.
According to the Adobe Javascript Scripting Guide, you can invoke a SOAP Web Service method from a JavaScript action in a PDF File. You can then create a JavaScript action that calls a web service and set it to the OpenAction event of the Catalog dictionary, this event will be called when the file is opened.
Here is another question where I also recommended using the OpenAction event.