You can currently freely run any proprietary program you can legally obtain a copy of. Good luck legally obtaining a copy of one with copyright law in force: the vendor won't give you a copy if you don't agree to the EULA, and nobody else can legally give you a copy.

Also, copyright law (the DMCA in particular) does prohibit some reverse engineering, namely reverse engineering for the purposes of bypassing copyright enforcement mechanisms.

Regarding "moral rights": so copyright should go, except the parts you personally want to use? No, let's throw the whole thing out. "Moral rights" represent an abomination even worse than copyright, because at least you can waive any and all parts of copyright with a Free and Open Source license. Copyright does not derive from some moral imperative; it represents a tradeoff long overdue for re-evaluation.