The Internet Archive is hardly an example of legal copyright free use. Four major publishers took them to court, and the Internet Archive lost. The judge's ruling said:
" ... the Internet Archive had digitized “millions of print books and [distributed] the resulting bootleg ebooks free of charge from its site, without the consent of the publishers and their authors or the payment of any license fee."https://publishingperspectives.com/2024/03/us-publishers-file-a-brief-opposing-the-internet-archives-appeal/#:~:text=The%20original%20lawsuit%20was%20filed,payment%20of%20any%20license%20fee.%E2%80%9DIt's going through appeal now. As a book author and with a life-long career in publishing at both public and private organizations, I don't condone copyright piracy. For every "forum police" there are more than enough gimmepig scofflaws.
The book is, indeed, still under copyright, is still for sale on Amazon and at other book sellers. And, no, not declaring yourself to be the author doesn't give anyone the liberty of freely distributing a copyrighted publication as an eBook. It don't work that way, folks.
I've purchased books from Ginter Publishing. They contain much more than just the original Air Force tech manuals in their content. It's pretty foolhardy for a website to condone piracy. Maybe better to point out this illegal, yes, illegal copyright violation than see one of our favorite flightsim sites get into trouble.
There's no indication anywhere that publisher Steve Ginter and author Earl Berlin have declared the C-124 book to be a freebie. It is still copyright protected. I'm sure Ginter Books and ISP Network Solutions, simviation's hosting service, will sort it out if simviation.com admins do not. Pete needs to make do diligence here 'cause it's pretty clear what's going on.