Glider does not bypass warden. Glider is stealthy and is not detected by Warden.
The word is not 'bypass,' it's 'circumvent.' Glider circumvents Warden by avoiding detection.
Glider is not a tool that "accesses elements of a copyrighted work". It is a tool which accesses elements of a copyrighted work that you, as the user/developer, have a legal license to access
As you state, Glider is a tool that accesses elements of a copyright work. Everything starting with "that you" does not matter, because the DMCA does not permit you to make a circumvention tool just because you have a license.
In other words, Glider does not bypass protection mechanisms granting you the ability to access copyrighted work without a license.
Again, you've added words that don't matter under the letter of the law. All that matters is that something accesses elements of a copyrighted work and circumvents access control mechanisms to do so. It doesn't matter if you bought it. For example, people who buy a DVD cannot legally create or distribute DeCSS (or modern equivalent).
Repeat after me: the DMCA is not about preventing copyright violation. It is about the copyright holder controlling the work once it's in your hands.
Sendmail may be safely run set-user-id to root. -- Eric Allman, "Sendmail Installation Guide"