So the September 2006 Anderson memo says:
“Videotaping of any type, including but not limited to taping of an opponent’s offensive or defensive signals, is prohibited on the sidelines, in the coaches’ booth, in the locker room, or at any other locations accessible to club staff members during the game.”
It seems clear from the context here that the letter is talking about location, not what is being filmed. The "... including but not limited to ... signals" is a clarication of sorts. What is really being said is you can't film from "locations accessible to staff member during the game."
Who knows what Anderson meant to communicate. BB pointed out ambiguities elsewhere in the rules/guidelines. We're making things up as we go along here, so nobody should be surprised when you end up with hash instead of chocalte pudding.