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.
It is impossible to enjoy idling thoroughly unless one has plenty of work to do. -- Jerome Klapka Jerome