Although rights to modification of the Software Product are granted by this EULA, you may not tamper with, alter, or use the Software Product in a way that disables, circumvents, or otherwise defeats its built-in licensing verification and enforcement capabilities. The right to modification of the Software Product also does not include the right to remove or alter any trademark, logo, copyright or other proprietary notice, legend, symbol or label in the Software Product. You may at your discretion distribute patch files containing any modifications or improvements made to the Software Product, other than those that are aimed at disabling or circumventing its built-in license verification capabilities, that result in the removal or alteration of any trademark, logo, copyright, or other proprietary notice, legend, symbol or label in the Software Product. This right does not include the right to distribute substantial portions of the original source, where distribution rights are limited to contextual information normally existing in software patch files. You may at your discretion designate license terms, open source or otherwise, for all modifications or improvements made by you.
Archaeopteryx has no special rights to any such modifications or improvements.
You may make copies of the Software Product as reasonably necessary for its use. Each copy must reproduce all copyright and other proprietary rights notices on or in the Software Product. You may install each Software Product License on a single computer system. A second installation of the same Software Product License may be made on one other computer system, so long as both copies of the same Software Product License never come into concurrent use. Backup and archival copies may not come into active use, together with the Software Product, for any purpose.