Customizing Existing Courses

If you have a public domain course you might contract to customize that course for a specific purpose or organization, thus creating a marketable original work.

At what point does your reworking of a public domain class constitute an original work? If less than 25% of the original material is included, you might be justified in legally claiming originality. What can you "borrow" from the work of others, and what may others have a right to borrow from your work? An increasing number of quality free online courses are available for you to use when creating your courses.