If you copy very short extracts of copyrighted work, you have to cite properly. If you want to copy significant fractions of any copyrighted work, you a) have advance permission by the copyright owner or b) violate laws when failing to be significantly creative on your own. Single positions without text or creative grouping, collection or structure cannot be copyrighted. Creativity for such is copyrighted if present in a medium. Work more than 70 years old might be without copyright.
A problem can have correct play. Accordingly, different creative work using the same correct analysis cannot copyright the right to explain the correct. However, the explanatory text given or the exact choice of diagram structure and formatting can be copyrighted.
Be creative! Do not just copy! Create your own selection, grouping, structure, comments WITHOUT copying more than very short parts (which also need citation).
For instance, you might create your collection of vital point problems by citing 5 problem positions each from 100 different books and provide your own solution diagrams and comments.
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