I may need to make this a little more clear: "What happens (or can happen) when connecting to a website from a pdf file?" I mean, when - in a pdf file - this pdf file wants to connect to the website it initially was downloaded from. C~.

"There are a number of things within a PDF file that can request data from a webserver, or post data back to one, but they can only be triggered by the PDF file - not the server.

• A form can submit completed fields to the server, and read a response message (e.g. to confirm the data is correct) 
• A rich media annotation (Flash, video or audio) can download content from the server instead of embedding it in the file 
• Scripts within a specially-written PDF file can communicate with a server using protocols such as SOAP, to retrieve data (e.g. to look up information in a remote database)

There's no immediately-obvious way to tell exactly what information is being sent or received unless you inspect the PDF in some detail; but because of the security models used by Acrobat and Adobe Reader, files which communicate with a remote server cannot read or write data from your own computer without your interaction - so they cannot secretly upload files, passwords, etc."

Thank you very much for your explanation.

I understand the three points you explaned. It is just hard to apply them to the kind of pdf file I am referring to. But I don't know anything about adobe reader, and that may very well be the reason for my lack of understanding.

The file is an explanation, a pattern of a craft project, with extensive drawings to help understanding the directions. The website has many patterns (all pdf files) of the very same kind available.

I believe I understand your explanation, but again, it is hard to imagine why a simple pdf file like the one we're talking about would need to connect with the website it came from. But then again, I know NOTHING about pdf files.

So, in my simple mind, I felt I had to deny permission to connect which I have now made possible again. It's annoying to see something like this happen and not have a CLUE what it is about

Thank you again for your help.

Ciske.