If you've chosen the Selection tool in Reader (icon of I-beam & arrow), the tool allows you to select objects so they can be copied.
The only way to disable that would be to open the PDF in Acrobat Pro, go to File > Properties > Security, select Password Security, and turn off the Content Copying attribute.
Thanks for your reply,
Yes, I have enabled security in the PDF export options, but that didn't solved it.
In my testcase below, I simple place an image in InDesign, and export the design using the following options:
Opening the PDF and clicking the image once it still gets selected/highlighted. (Although the file is now "[SECURED]", with image saving capability now disabled.). So, still, very annoying visually.
I know it can be done not to show it. But I'm guessing if InDesign allows it.
Please check this link:
The cover page of this manual, for instance, shows it done properly. If you click it, the image is not highlighted.
I even "forced" the unprotection of that link PDF, to check if it was related with security but seems it's not, as breaking protection does not damage it.
(In the document properties it says they have used FrameMaker+SGML, but I don't have that software and am puzzled on how I can achieve it in InDesign.)
I'm clueless, Looking forward for any hints that anyone can share
Why not just change to the Hand tool?
I'd agree with Peter. The Hand tool is the primary navigation tool in Reader or Acrobat and it's what the majority of users would choose.
I don't think it's worth worrying about it.
In order to prevent selection of images in a PDF, the images you import must be vector graphics (.svg, generated by Adobe Illustrator, inkscape and other vector image editors).
If the images in question are raster graphics (.png, .jpg, .bmp etc) they easily can be selected by a single mouse click making the images appear blue.
Hope this answers the question, albeit late.
I'm also having an issue with this. Are there any export settings in InDesign that will address this?