The details are a bit fuzzy to me now, but back in the eighties the feds spent millions on development of an unbreakable code that everyone was to use to encrypt their emails. Once the system was released, a couple college students broke the encryption system in about two days.
I've been involved in microcomputer software development since early 1977. I was around when Bill Gates bought QDOS from Tim Patterson and turned it into DOS for IBM, and MSDOS for Microsoft. I suspect Bill wouldn't have made as many billions as he made if he hadn't, essentially, ignored the fact that people were stealing MSDOS wholesale. I had a friend, now deceased, who had a business assembling and selling microcomputers with MSDOS on them. As far as I know he only paid for one copy of MSDOS. He wasn't the only one doing it, but Microsoft wasn't going out of its way to enforce its copyright. One reason was CP/M (Control Program/Microcomputer) that Gary Kildall was selling. CP/M was a competitor, and a much better piece of software then DOS. Early versions of Windows also were mostly bootleg copies. Until Windows NT came along Windows was simply an interpreter that sat on top of DOS, and Microsoft needed lots of Windows systems out there so they could sell Microsoft Word, Microsoft Office, and the other inflated products that took advantage of DOS. Once NT, which actually was an operating system, came along though, Microsoft started paying close attention to copyright.
There are some advantages in not getting too uptight about copyright.