We don't have synonyms for copy after yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are come after.
°Allowing use, distribution, and modification on the condition that any redistributions or modifications also be licensed under the same condition and, in the case of computer software, are accompanied by source code.
"The GNU General Public License is a copyleft licence."
°Allowing use, distribution, and modification on the condition that any redistributions or modifications also be licensed under the same condition and, in the case of computer software, are accompanied by source code.
"The GNU General Public License is a copyleft licence."