Wiccans tend to be against secrets. Most Wiccans are against secret lists of banned web sites in Internet monitoring software and against secret decision making in government. Most Wiccans know that too much secrecy can easily be used to cover up things that would fare very poorly if exposed to public scrutiny, such as blocking access to Pagan web sites while claiming to only block porn and hate sites.
Unfortunately, some Wiccans do not practice what they preach when it comes to secrecy. While they condemn secrecy in others, they still maintain broad oaths of secrecy about their particular practices. While keeping most religious and magical material oathbound might have been necessary during the Burning Times or in England prior to the repeal of the laws against Witchcraft, I certainly see no need for it now -- at least in most "first world" countries. Names and addresses of group members, perhaps, but ritual information, no.
Those who insist that secrecy is necessary in Wicca generally use some common arguments to support their position. Oathbound The term Oathbound refers to the Oath of secrecy regarding the "Secrets of the Art" which the Initiate swears during their Initiation. The concept of Initiaton, involving an Oath of secrecy, has always been a hallmark of the Pagan Mysteries, for example the Mysteries of Isis and the Eleusinian Mysteries.