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When you copy/paste from Illy to ID you will get either editable paths or an embedded PDF, depending on the complexity of the illustration and the settings you use for the clipboard. There is no link maintained to the original. For that you should Place the illustration.
Thanks for your reply. I assume there's no link maintened to the original. One day, that probably the best way to change any object. Thanks and have a nice day
No. ALL objects that are PLACED (File >Place...) except for text and spreadsheet files are automatically linked to the original (you are really putting a pointer to the original file in the document, not the actual data), and you can choose to link text and spreadsheets as well. This not only keeps the file size down -- you can have hundreds, or thousands of pages in your document with hundreds or thousands of linked images -- but allows you to modify the original file and update the link inside ID at any time.
You can embed a linked file if you choose, but there is really no advantage in most workflows, and you can paste from Illustrator if you choose. The advantage to pasting is that you can edit the individual paths locally in your ID file without affecting the original, but the disadvantage is you lose any connection to the original. Having worked both ways I've come to the conclusion that any convenience from pasting is outweighed by the lack of portability and the loss of edit-once-update-many capability for most situations.