The letter of copyright law might allow a prohibition of forking and relicensing (to reiterate, the TC author would have to reveal him or herself in order to enforce that prohibition), but philosophically...

"I don't feel that forking truecrypt would be a good idea..."

This is a straight-up abuse of copyright law. Author has no intent of profiting from the project, no intent of continuing to work on the project, and still waves around the hammer of copyright as if it's a fundamental right absent any connection to the constitutional qualification of promoting progress in the sciences and useful arts.

To say there's a moral imperative against forking and relicensing in this scenario is stretching the rationale for the copyright monopoly quite far.

Interesting. To who else's work can you write a nerd message board post explaining your intrinsic entitlement?

It's not at all shocking that the creator and maintainer of a free encrypted filesystem would eventually abandon the effort, given that comments like these are how the effort is ultimately repaid.

Is there a name for the hammer you swing, the hammer not of abusing copyright but instead of not writing simulated hardware disk encryption and donating it for free? It seems to me that's a far mightier hammer than the one you described.

From each according to their ability and all that. Oh, you can write crypto software? Therefore you must write it for me.

Uh oh, it looks like @tptacek's calling people message board nerds again.

I'm @tqbf, not @tptacek. @tptacek is some other person on Twitter.

I'm still wondering whether this is an elaborate way to tell people that Trucrypt is completely compromised and shouldn't be used.

Of course you are. That's a fun thought experiment. Details of licensure, burned out developers, and Truecrypt's modern place among all the other encrypted storage schemes are much more boring than the cloak and dagger fiction of a Truecrypt warrant canary.

Since the developer(s) is/are anonymous - why would they need any elaborate way of telling people this? They could just state that they consider the code compromised and advise not to use it anymore.