[NTG-context] Is it posslible to use remotely loaded image in PDF?

Hello all, I'm just wondering if it is possible to create PDF document which contains image (link to image) which is downloaded from the Internet and displayed at the moment when PDF is opened? Maybe it is not possible because some security reasons. I've spent hours googling it, but without satisfying answer (may be I'm just lame). Thanks a lot for answer. Rosta