Consider licensing your OER to allow derivative works so others can make a copy and edit to fit their course and learner needs. If your OER is written text be sure to make it available in an editable format such as .doc, .rtf (rich text format), EPUB3 format or on an OER platform such as OER Commons or MERLOT. Only providing the OER in .pdf format will make modifying your work much harder to do.