@Nick – no. That's not possible. If you give your InDesign file out of hand, everybody can manipulate this.
However, there are existing dedicated workflow systems, that can control what you want. But this is another costly story.
I know it's only an example, but if you want them to change any images, just send the images and update the links or relink to your InDesign file.
What is the costly option? I want to be able to send the Indesign doc abroad, so the client can change the images, but not the copy.
I wouldn't send the InDesign file. Just a PDF plus the images…
For the workflow systems with version control and user authorization, I think we talk about 10,000 of $$ plus an extra amount of learning the system…
Don't know what versions of InDesign they support. Don't know if it's reliable at all or would fit your needs. Don't know if it's only something for large companies. Don't know if it will be around the next years (last news blog entry is from June 2012).
No idea what that will cost you, but you could ask:
Use InCopy and only export the images as ICML content.
I'm sorry, but I've never used 'InCopy' before and don't know what ICML content is?
I need to supply the InDesign doc and stop people from editing the text. By exporting the images as ICML content, how will this help?
The text will still be editable won't it?