There are multiple kinds of materials in this respoistory and each has a different license:
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The source code (i.e. PHP source, autograders, etc.) is licensed under Apache 2.0
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The learning content (i.e. lectures, assignments, how-tos) is licensed under Creative Commmons Attribution 4.0
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The text book content in this repository is used under a "Fair Use" only for the purpose of teaching a course centered around placing this historically significant work in its rightful context in the evolution and in many ways, foundation of modern Computer Science. This material is made freely available at www.cc4e.com and any other use is not covered under fair use. Here is the original copyright from the "C Programming" text book:
Copyright @ 1978 by Bell Telephone Laboratories, Incorporated.
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. Printed in the United States of America. Published simultaneously in Canada.
UNIX is a Trademark of Bell Laboratories.