The phrase "confidentiality reasons" means that information cannot be shared or discussed with others because it's private and should be kept secret. Full definition
I take food photos almost every day, but not everything makes it onto my blog because I do a lot of client work that I can't always share for confidentiality reasons. (theluminouskitchen.com)
That's not her real name, but for confidentiality reasons I won't disclose her real name. (bookcovercafe.com)
And finally about, you know, through the course of this time, some people at the Humane Society and friends of theirs were — they wouldn't tell us who the person was because of confidentiality reasons — but started telling us some information about where that this person had been trapping. (voxfelina.com)