In short, plain english, the important parts of the licence are:

-If you buy the licence, you can use it in as many commercial products as you want and get full tech support.
-Without the licence, you can use it for your own needs, ie you are not allowed to make commercial gain directly or indirectly from a product using EvoGUI without purchasing the licence.
-With or without the licence, you are obliged to share modifications to the code with the Initial Developer, and if you want to share it with the community. The Initial Developer may use your code in his own commercial projects.
-You can't resell or transfer the licence after purchasing it.
-You can't modify the system just a little and sell it as your own product.
-You must mention EvoGUI in any commercial release, so people know what is what, and what they are purchasing with your product.
-Individuals and legal entities (companies) are treated the same way.

The actual complete licence is as follows:

• 1. Definitions.
• 1.1. Contributor means each
  individual or entity that creates or contributes to the creation of
  Modifications.
• 1.2. Contributor Version means
  the combination of the Original Software, prior
  Modifications used by a Contributor (if any), and the
  Modifications made by that particular Contributor.
• 1.3. Covered Software means (a)
  the Original Software, or (b) Modifications, or (c) the
  combination of files containing Original Software with files
  containing Modifications, in each case including portions
  thereof.
• 1.4. Executable means the
  Covered Software in any form other than Source Code.
• 1.5. Initial Developer means
  the individual or entity that first makes Original Software
  available under this License.
• 1.6. Larger Work means a work
  which combines Covered Software or portions thereof with
  code not governed by the terms of this License.
• 1.7. License means this
  document.
• 1.8. Licensable means having
  the right to grant, to the maximum extent possible, whether
  at the time of the initial grant or subsequently acquired,
  any and all of the rights conveyed herein.
• 1.9. Modifications means the
  Source Code and Executable form of any of the following:
• A. Any file that results from an addition
  to, deletion from or modification of the contents of a
  file containing Original Software or previous
  Modifications;
• B. Any new file that contains any part of
  the Original Software or previous Modification; or
• C. Any new file that is contributed or
  otherwise made available under the terms of this
  License.
• 1.10. Original Software means
  the Source Code and Executable form of computer software
  code that is originally released under this License.
• 1.11. Patent Claims means any
  patent claim(s), now owned or hereafter acquired, including
  without limitation, method, process, and apparatus claims,
  in any patent Licensable by grantor.
• 1.12. Source Code means (a) the
  common form of computer software code in which modifications
  are made and (b) associated documentation included in or
  with such code.
• 1.13. You (or
  Your) means an individual or a legal
  entity exercising rights under, and complying with all of
  the terms of, this License. For legal entities,
  You includes any entity which controls, is
  controlled by, or is under common control with You. For
  purposes of this definition, control means
  (a) the power, direct or indirect, to cause the
  direction or management of such entity, whether by contract
  or otherwise, or (b) ownership of more than fifty
  percent (50%) of the outstanding shares or beneficial
  ownership of such entity.
• 2. License Grants.
• 2.1. The Initial Developer Grant.

Conditioned upon Your compliance with Section 3.1
below and subject to third party intellectual property
claims, the Initial Developer hereby grants You a
world-wide, royalty-free, non-exclusive license:

• (a) under intellectual property rights
  (other than patent or trademark) Licensable by Initial
  Developer, to use, reproduce, modify, display, perform,
  sublicense and distribute the Original Software (or
  portions thereof), with or without Modifications, and/or
  as part of a Larger Work under the condition that the final work does not result in direct or indirect commercial gain, unless You have obtained a licence for commercial use from the Initial Developer.
• (b) under Patent Claims infringed by the
  making, using or selling of Original Software, to make,
  have made, use, practice, sell, and offer for sale,
  and/or otherwise dispose of the Original Software (or
  portions thereof).
• (c) The licenses granted in
  Sections 2.1(a) and (b) are effective on the date
  Initial Developer first distributes or otherwise makes
  the Original Software available to a third party under
  the terms of this License.
• (d) Notwithstanding Section 2.1(b)
  above, no patent license is granted: (1) for code
  that You delete from the Original Software, or
  (2) for infringements caused by: (i) the
  modification of the Original Software, or (ii) the
  combination of the Original Software with other software
  or devices.
• 2.2. Contributor Grant.

Conditioned upon Your compliance with Section 3.1 below
and subject to third party intellectual property claims,
each Contributor hereby grants You a world-wide,
royalty-free, non-exclusive license:

• (a) under intellectual property rights
  (other than patent or trademark) Licensable by
  Contributor to use, reproduce, modify, display, perform,
  sublicense and distribute the Modifications created by
  such Contributor (or portions thereof), either on an
  unmodified basis, with other Modifications, as Covered
  Software and/or as part of a Larger Work under the condition that the final work does not result in direct or indirect commercial gain, unless You have obtained a licence for commercial use from the Initial Developer.; and
• (b) under Patent Claims infringed by the
  making, using, or selling of Modifications made by that
  Contributor either alone and/or in combination with its
  Contributor Version (or portions of such combination),
  to make, use, sell, offer for sale, have made, and/or
  otherwise dispose of: (1) Modifications made by
  that Contributor (or portions thereof); and (2) the
  combination of Modifications made by that Contributor
  with its Contributor Version (or portions of such
  combination).
• (c) The licenses granted in
  Sections 2.2(a) and 2.2(b) are effective on the
  date Contributor first distributes or otherwise makes
  the Modifications available to a third party.
• (d) Notwithstanding Section 2.2(b)
  above, no patent license is granted: (1) for any
  code that Contributor has deleted from the Contributor
  Version; (2) for infringements caused by:
  (i) third party modifications of Contributor
  Version, or (ii) the combination of Modifications
  made by that Contributor with other software (except as
  part of the Contributor Version) or other devices; or
  (3) under Patent Claims infringed by Covered
  Software in the absence of Modifications made by that
  Contributor.

2.3. Restrictions and permissions upon obtaining the licence for commercial use:

• 3. Distribution Obligations.
• 3.1. Availability of Source Code.

Any Covered Software that You distribute or otherwise make available in Executable form must also be made available in Source Code form to the Initial Developer and that Source Code form must be distributed only under the terms of this License. You must include a copy of this License with every copy of the Source Code form of the Covered Software You distribute or otherwise make available. You must inform recipients of any such Covered Software in Executable form as to how they can obtain such Covered Software in Source Code form in a reasonable manner on or through a medium
customarily used for software exchange, and with agreement of the Initial Developer.

• 3.2. Modifications.

The Modifications that You create or to which You contribute are governed by the terms of this License. You represent that You believe Your Modifications are Your original creation(s) and/or You have sufficient rights to grant the rights conveyed by this License.

• 3.3. Required Notices.

You must include a notice in each of Your Modifications that identifies You as the Contributor of the
Modification. You may not remove or alter any copyright, patent or trademark notices contained within the Covered Software, or any notices of licensing or any descriptive text giving attribution to any Contributor or the Initial Developer. For commercial products, You must include information about the Original Software including it’s name and the name of the Initial Developer.

• 3.4. Application of Additional Terms.

You may not offer or impose any terms on any Covered Software in Source Code form that alters or restricts the applicable version of this License or the recipients rights hereunder. You may choose to
offer, and to charge a fee for, warranty, support, indemnity or liability obligations to one or more
recipients of Covered Software. However, you may do so only on Your own behalf, and not on behalf of the Initial Developer or any Contributor. You must make it absolutely clear that any such warranty, support, indemnity or liability obligation is offered by You alone, and You hereby agree to indemnify the Initial Developer and every Contributor for any liability incurred by the Initial Developer or such Contributor as a result of warranty, support, indemnity or liability terms You offer.

• 3.5. Distribution of Executable Versions.

You may distribute the Executable form of the Covered Software under the terms of this License or under the terms of a license of Your choice, which may contain terms different from this License, provided that You are in compliance with the terms of this License and that the license for the Executable form does not attempt to limit or alter the recipients rights in the Source Code form from the rights set forth in this License. If You distribute the Covered Software in Executable form under a different license, You must make it absolutely clear that any terms which differ from this License are offered by You alone, not by the Initial Developer or Contributor. You hereby agree to indemnify the Initial Developer and every Contributor for any liability incurred by the Initial Developer or such Contributor as a result of any such terms You offer.

• 3.6. Larger Works.

You may create a Larger Work by combining Covered Software with other code not governed by the terms of this License and distribute the Larger Work as a single product. In such a case, You must make sure the requirements of this License are fulfilled for the Covered Software.

• 4. Versions of the License.
• 4.1. Effect of New Versions.

You may always continue to use, distribute or otherwise make the Covered Software available under the terms of the version of the License under which You originally received the Covered Software. If the Initial Developer includes a notice in the Original Software prohibiting it from being distributed or otherwise made available under any subsequent version of the License, You must distribute and make the Covered Software available under the terms of the version of the License under which You originally received the Covered Software. Otherwise, You may also choose to use, distribute or otherwise make the Covered Software available under the terms of any subsequent version of the License published by the license steward.

• 4.2. Modified Versions.

When You are an Initial Developer and You want to create a new license for Your Original Software, You may create and use a modified version of this License if You: (a) rename the license and remove any references to the name of the license steward (except to note that the license differs from this License); and (b) otherwise make it clear that the license contains terms which differ from this License.

• 5. DISCLAIMER OF WARRANTY.

COVERED SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN
AS IS BASIS, WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION,
WARRANTIES THAT THE COVERED SOFTWARE IS FREE OF DEFECTS,
MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE OR NON-INFRINGING.
THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
COVERED SOFTWARE IS WITH YOU. SHOULD ANY COVERED SOFTWARE
PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT THE INITIAL DEVELOPER
OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY
CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. NO USE OF ANY
COVERED SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS
DISCLAIMER.

• 6. TERMINATION.
• 6.1. This License and the rights granted
  hereunder will terminate automatically if You fail to comply
  with terms herein and fail to cure such breach within 30
  days of becoming aware of the breach. Provisions which, by
  their nature, must remain in effect beyond the termination
  of this License shall survive.
• 6.2.
  If You assert a patent infringement claim (excluding declaratory
  judgment actions) against Initial Developer or a Contributor (the
  Initial Developer or Contributor against whom You assert such claim is
  referred to as Participant) alleging that the Participant Software
  (meaning the Contributor Version where the Participant is a Contributor
  or the Original Software where the Participant is the Initial
  Developer) directly or indirectly infringes any patent, then any and
  all rights granted directly or indirectly to You by such Participant,
  the Initial Developer (if the Initial Developer is not the Participant)
  and all Contributors under Sections 2.1 and/or 2.2 of this License
  shall, upon 60 days notice from Participant terminate prospectively and
  automatically at the expiration of such 60 day notice period, unless if
  within such 60 day period You withdraw Your claim with respect to the
  Participant Software against such Participant either unilaterally or
  pursuant to a written agreement with Participant.
• 6.3. In the event of termination under
  Sections 6.1 or 6.2 above, all end user licenses
  that have been
  validly granted by You or any distributor hereunder prior to
  termination (excluding licenses granted to You by any
  distributor) shall survive termination.
• 7. LIMITATION OF LIABILITY.

UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, WHETHER
TORT (INCLUDING NEGLIGENCE), CONTRACT, OR OTHERWISE, SHALL
YOU, THE INITIAL DEVELOPER, ANY OTHER CONTRIBUTOR, OR ANY
DISTRIBUTOR OF COVERED SOFTWARE, OR ANY SUPPLIER OF ANY OF
SUCH PARTIES, BE LIABLE TO ANY PERSON FOR ANY INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER
INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOST PROFITS, LOSS OF GOODWILL,
WORK STOPPAGE, COMPUTER FAILURE OR MALFUNCTION, OR ANY AND ALL
OTHER COMMERCIAL DAMAGES OR LOSSES, EVEN IF SUCH PARTY SHALL
HAVE BEEN INFORMED OF THE POSSIBILITY OF SUCH DAMAGES. THIS
LIMITATION OF LIABILITY SHALL NOT APPLY TO LIABILITY FOR DEATH
OR PERSONAL INJURY RESULTING FROM SUCH PARTYS
NEGLIGENCE TO THE EXTENT APPLICABLE LAW PROHIBITS SUCH
LIMITATION. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR
LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THIS
EXCLUSION AND LIMITATION MAY NOT APPLY TO YOU.

• 8. MISCELLANEOUS.

This License represents the complete agreement concerning
subject matter hereof. If any provision of this License is
held to be unenforceable, such provision shall be reformed
only to the extent necessary to make it enforceable. This
License shall be governed by the law of the jurisdiction
specified in a notice contained within the Original Software
(except to the extent applicable law, if any, provides
otherwise), excluding such jurisdictions
conflict-of-law provisions. Any
litigation relating to this License shall be subject to the
jurisdiction of the courts located in the
jurisdiction and venue specified in a notice contained within
the Original Software, with the losing party responsible for
costs, including, without limitation, court costs and
reasonable attorneys fees and expenses. The
application of the United Nations Convention on Contracts for
the International Sale of Goods is expressly excluded. Any
law or regulation which provides that the language of a
contract shall be construed against the drafter shall not
apply to this License. You agree that You alone are
responsible for compliance with the United States export
administration regulations (and the export control laws and
regulation of any other countries) when You use, distribute or
otherwise make available any Covered Software.

• 10. RESPONSIBILITY FOR CLAIMS.

As between Initial Developer and the Contributors, each
party is responsible for claims and damages arising, directly
or indirectly, out of its utilization of rights under this
License and You agree to work with Initial Developer and
Contributors to distribute such responsibility on an equitable
basis. Nothing herein is intended or shall be deemed to
constitute any admission of liability.

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