Protect official publications of law in a digital format through authentication using technological measures, in order to ensure that the content is trustworthy, and make this clear to people. (slaw.ca)
See also the FAQ Application of effective technological measures by users of CC - licensed works prohibited. (law.stackexchange.com)
Also, do you want to «lock» the e-book in any manner and use technological measures to ensure that only authorized persons may access, reproduce or forward copies of your e-book? (copyrightlaws.com)