Can I re-write an instruction manual?

[ladymissfoofoo]

Hello,

I'm a Copywriter working for a marketing/web design agency, and we're currently looking to re-write sections from a published manual about eCommerce websites for the benefit of our eCommerce clients.

Would it be possible for you to let me know if there are any Copyright issues with us taking information from certain pages and re-writing them, plus re-producing screen-shots that might appear within the book?

This manual will not be published, will not be used commercially and will not gain profit for our organisation in any way, but WILL be sent out to a handful of our clients as a step-by-step guide to using a piece of software.

Would be grateful for your guidance on this,

Thank you