[philistine]

> If you search around though you will find many posts on lawyers' websites and other places that argue it is possible to actually lose your own copyright.

Citation needed. You can lose an unused trademark through misuse. You cannot lose copyright. Impossible. You can willingly relinquish something to the public domain. But that's it.

[ranger_danger]

Lopez v. Electrical Rebuilders, Inc., 416 F.Supp. 1133, 1135 (C.D.Cal.1976). Acquiescence, with full knowledge in the publication of a vast number of copies without copyright notice, may work a forfeiture.

Transgo, Inc. v. Ajac Transmission Parts Corp., 768 F.2d 1001, 1019, 227 USPQ 598, 82 A.L.R.Fed 97 (C.A.9 (Cal.), 1985). Publication by a licensee of “vast numbers of copies without copyright notice may work a forfeiture” if done with full knowledge of a licensor who acquiesces.

The limitations period for bringing copyright infringement claims is three years after the claim accrues. See 17 U.S.C. S 507(b)

I have also seen several times where a project owner is made aware (e.g. via mailing list or github issue etc.) of an infringement and then they make a comment like "we do not have the money to fight this", and so then if three years passes after that point, the infringer basically gets away with it.

Also, most people do not register their copyrights, which:

Failure to Register Before Enforcement: In the U.S., while copyright protection is automatic, you must register the copyright with the U.S. Copyright Office before you can file a lawsuit for infringement in federal court. You have no proof that you own a copyright if you do not file for one. If you try to enforce it before you register the copyright, it can later become invalidated, or its validation process can be terminated.

[philistine]

Those have nothing to do with losing copyright. Forgetting to file for copyright, sure. But not losing copyright you have.

If you have standing and you don’t sue for lack of money, of course the infringer gets away with it! Your right was not extinguished though. You don’t have the right to bludgeon others, you have the exclusive right to copy.

[ranger_danger]

Semantics... I consider the rightsholder generally acknowledging any infringement but not doing anything about any of it, combined with other people getting away with infringing, as functionally equivalent to "losing" the copyright. You might disagree but that's okay.

[philistine]

> Semantics...

Try telling that to a lawyer. Not enforcing your exclusive privileges does not extinguish your rights. People don't lose the right to vote if the government refuses to enforce election fraud.

You are wrong in the legal sense, and copyright is a very legal matter.

[ranger_danger]

I think you are assuming that by "lose" I meant indefinitely, and for any and all future cases... but I explicitly defined what I meant, which was the cases where the rightsholder was made aware of an infringement, chose not to litigate, and then the statute expired, leading to a functional equivalence of losing the copyright in that one instance. I think a lawyer would appreciate the detail, and I don't think I am on trial for my own semantics here either, so I'm not sure what the actual disagreement is, besides that you don't like the way I used the word "lose".

[philistine]

> it is possible to actually lose your own copyright.

You have so many caveats ipso facto. You did not qualify it at first.