There are different types and levels of security, especially when it comes to the Internet. The TMO database exported from Hy-Tek's TEAM MANAGER software DOES NOT include any confidential data such as telephone numbers, addresses, birth dates, IDs, etc. It contains only the swimmer's name, gender and age as well as meet results.
If you wish, request that Hy-Tek "hide" your TMO link from it's TMO web site so the only way that someone can "find" your TMO database is from your team's or league's web site. If you do not wish competitor teams or other people seeing this information, it is up to you to provide whatever level of security you feel appropriate at your web site. For example, you could assign either a global User ID and Password so that all the members of your team or league would have the same user ID and Password. Or, you could assign unique user IDs and Passwords to each swimmer or family on your team or league.