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I don't recall hearing of receiving this message from a PDF created in InDesign. I have heard that malicious code can be included in a PDF file, however, so I'm familiar with the message,
But it seems like the key thing from your description is this:
> When I did the document without the videos I didn’t receive the message. But this is not an option for me. I need them.
So perhaps there is malicious code in one of the videos.
You could use the tried-and-true (but somewhat tedious) method of including half of the videos but not the other half and see if you get the message. If only the PDF with the first half of the videos fails you know it's in that half; if it appears only in the second half, then it's in that half. You progressively removed videos until you see the culprit.
Another possibility: Process the video(s) in an app like Adobe Media Encoder which would recreate the code. That's part of your Creative Cloud subscription.
Dear Steve, thank a lot for your reply.
By chance, I was doing exactly this right now, the tried-and-true you suggested.
And it is quite weird.
I have 25 videos.
I spared a pdf with only the videos.
The pdf with the 01-12 showed no problems. I played it like 5 times and nothing happened.
The pdf 13-25 presented the message.
I proceed to pdf 13-19 that presented no errors.
And, then, weirdly, the 20-25 also presented no error messages.
But I think if I keep playing on and on, at some point I might have a message. As I said, it is a bit random the timing and place it appears.
A note on the videos: all of them were made by myself. I am pretty sure I would not include a malicious in it.
But I really appreciate your suggestion on recreating the videos on Adobe Media Encoder.
Just downloaded the app, will give a try.
Once again, thank you very much for your reply. I will post if your suggestion works or not.
Dear Steve... no luck.
Still the warnings after re-exporting all videos.
Will follow your advice and ask in the Adobe Rich Media forum.