Dividing large files into smaller units

As the Disability Services officer for a small state college, I obtain textbooks in PDF format for some students. With a software package, I can convert PDFs into mp3 files so students can hear as well as read their texts. However, occasionally I receive the entire textbook in one file, which is too large for our conversion program to handle. I would like to know if there is a convenient way (free would be good, too!) to divide an entire-text file into smaller chapter-by-chapter files.
Thanks!

Good day,
Depending on the security settings applied to the PDF text books you're receiving, you may be able to use Adobe Acrobat to divide the PDF files into smaller, more managable files that you can process through your conversion program.  We offer a 30-day trial of Adobe Acrobat X Professional for Windows here: http://www.adobe.com/go/tryacrobatpro/
As you're working for an educational institution, you may also qualify for our Student & Teacher Edition pricing. 
I hope this helps!
Kind regards,
David
Acrobat Community Manager
Adobe Systems

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