Discussion lists typically do not give you a correct to delete previous postings: Usenet and mailing list archives are eternally.
Many dialogue message boards I've been a section of allow deleting your individual posts. For that make any difference, "possession" rights might only signify that you retain copyright around the posts. That they don't give you a system to blindly mass-delete posts wouldn't modify your possession legal rights around them.
One rationale is just complex lack of ability (archives usually are not controlled by a central authority), but there is certainly also a perception that deleting miscellaneous posts from archives fragments the history of previous conversations. In these a circumstance, you are nonetheless the operator of the land, lawfully and in an everyday feeling.
That's irrelevant, even if the operator experienced only bought a single copy of his e-book, he would however not be in a position to need it back again. Some even allow enhancing. Endless things about how all my iTunes buys with DRM would dedicate suicide (I never created any) and how all my gadgets would quit functioning (battery died several years ago, won't be able to be bothered to pry the thing open to substitute it, if you can even buy third gen iPod batteries any much more).
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