If I understand correctly, the users of your site are simply bookmarking pages. You are then caching it, storing it, and publishing it with a world-readable URL. There are many ways that you could provide the same experience to the user without making the cached page publicly accessible.
If you were to give users the option to make specific bookmarks world-readable - and you provided a disclaimer explaining that they should not make copyrighted material world-readable - then it might be different. But that's probably something you should discuss with an attorney.
Thank you for the information, I'll talk to our lawyer about it just to be safe.
Thanks again!
Your copyright law is similar to the US or Israel based one, not so strict as the main european one, which is based on the napolion code and is very very strict.
Thanks for the feedback!
Edit: I think it's a great idea though to save bookmarked content, just not to republish it without permission.