>>>The main concern is the last clause, this sounds very limiting to me, should I limit it to a particular time period?
>>What I would do:
>>
>>Fourth clause: remove it, not relevant to disclosure
>>
>>I Am Not A Lawyer.
>>
>>If you're at all unsure, talk to your lawyer. There may be special considerations in your local legal system. Speaking of which, try to make it so disputes are handled in your local legal system.
>
>Maybe I shouldn't have called it an NDA, it's just a contract to assure them of confidentiality so I think they want those clauses in. Yes, I will run it by my lawyer.

strike 3 at least.
let them pay for the duration of the fourth clause - penalty 3 to 10 times the sum agreed upon if you decide otherwise.