What is the copyright?

You can read Sonlight's copyright information here. Your IG also contains copyright information.

One potentially relevant section may be this:

ALL curriculum we develop is copyright protected.

No part of the Instructor's Guides may be reproduced, stored, or transmitted. However, permission is granted to the original Sonlight purchaser only to reproduce as many copies of the Schedule Pages, Evaluation Form, Activity Sheets, Certificate of Completion, Life Skills Check-Off Lists, Field Trip Planning and Record Sheets, and Blank Record Sheets as necessary for his or her immediate family's use.