Is it legal to copy data from a subscription based education site using http://ricks-apps.com/osx/sitesucker/ or https://www.httrack.com. This is to be able to study the material when internet is not available or when my subscription to the online tool is ended. It will be strictly for my own personal use. The material will never be modified, posted somewhere else or sold in any shape or form. I can renew my subscription when I need access to new material but want to be able to do that only when I want the new content.
The site's terms mentions following which I completely agree with: "You will not modify, publish, transmit, reverse engineer, participate in the transfer or sale, create derivative works, or in any way exploit any of the content, in whole or in part, found on this website. "
I see a similar question here as well but don't look like anyone was able to reply about legality of the issue: https://forum.httrack.com/readmsg/27396/index.html