Just post the sermons on a site that doesn't apply to copyrights...simple as.
You are a bit confused about the applicability of laws:
Whomever would upload the sermons would be subject to prosecution/litigation for infringement.
Usually, there are "footprints" which lead back to the poster, and therefore his exposure to legal retaliation.
There are certain technologies which can hide those footprints, but they are a bit..."incongruent" with the priestly state, inasmuch as they imply defects in courage, principle, and integrity, and for that reason, all Resistance clergy in possession of the collection refuse to go that route, preferring to disseminate the contents only to the MOST trustworthy of laymen for safekeeping and posterity.
For now, you will have to take consolation in the fact that this dissemination is so widespread, Menzingen can never hope to recover sole ownership.
A dying man, or one facing bankruptcy, or just one who no longer cares what happens...one way or the other, it will all eventually come out.
God wills it.