Although it is often said that a work is protected by copyrestriction, this is strictly not true. A work is protected through the existence of lots of copies and lots of curators.
Free and open source software has demonstrated the ethical and practical value of the opposite of copyrestriction, which is not its absence, but regulation mandating the sharing of copies, specifically in forms suitable for inspection and improvement. This regulation most famously occurs in the form of source-requiring copyleft, e.g., the GNU General Public License (GPL), which allows copyrestriction holders to use copyrestriction to force others to share works based on GPL’d works in their preferred form for modification, e.g., source code for software. However, this regulation occurs through other means as well, e.g., communities and projects refusing to curate and distribute works not available in source form, funders mandating source release, and consumers refusing to buy works not available in source form.