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Adobe warns it may face massive fines for subscription rules
(www.theregister.com)
This is a most excellent place for technology news and articles.
If you distribute that PDF, users will be able to search, highlight, and copy "highlighted" text, no problem.
Realize this but my companies solution was to just print that version and scan back in the resulting version which cannot be undone. Stupid and wastful but saved us from buying a ton of Adobe licenses.