[screwdriver223]

Hi

I'm the editor of a textbook, and am interested in developing an ebook version to distribute with the next edition of the paper version. The textbook is ~1400 pages, and contains multiple figures, and tables. The book is published by a small publisher who is open to helping us deploy the book in whichever format we like. Ideally, the ebook would meet the following requirements:

1) Be accessible on iOS, Android, Blackberry and Windows (phones, tablets, and computers). If possible, the format should be easily readable on, and 'adapt' to, multiple devices. It's easy to make a pdf version of the textbook that looks great on a computer screen, but is a pain to navigate on a phone. Of course, maintaining the formatting of the paper text is not an option with this requirement, but we're fine with an HTML-like format where the text wraps as needed.

2) Use a format that is accessible worldwide (Canada and the US is key -- other countries would be a plus).

3) Distribution. Be able to distribute the etext free to those who purchase the paper text, or sell the etext alone to those who only wish to purchase the ebook. Ideally, we'd like to have another company (e.g., Amazon or B&N) handle distribution, but we could do this from our own website if necessary.

4) Have secure DRM. We put a lot of work into our textbook (and the proceeds go to charity). An ebook that can be stripped of DRM only to be torrented is an instant deal breaker.

5) Be searchable, and have users able to highlight and annotate sections.

Is there any format that can satisfy these requirements? I would greatly appreciate any advice this community can provide!

Thank you,
Dave