I have downloaded a project from CodeProject, which is bound by the CPOL. I've modified some its files to fix bugs, as well as adding files of my own for other features. I am planning to release my modifications under the MIT license. However, is it possible?
According to section 1
c) "Derivative Work" means a work based upon the Work or upon the Work and other pre-existing works.
d) "Executable Files" refer to the executables, binary files, configuration and any required data files included in the Work.
f) "Source Code" refers to the collection of source code and configuration files used to create the Executable Files.
h) "Work" refers to the collection of files distributed by the Publisher, including the Source Code, Executable Files, binaries, data files, documentation, whitepapers and the Articles.
According to section 5b
You may distribute the Executable Files and Source Code only under the terms of this License, and You must include a copy of, or the Uniform Resource Identifier for, this License with every copy of the Executable Files or Source Code You distribute and ensure that anyone receiving such Executable Files and Source Code agrees that the terms of this License apply to such Executable Files and/or Source Code. You may not offer or impose any terms on the Work that alter or restrict the terms of this License or the recipients' exercise of the rights granted hereunder. You may not sublicense the Work. You must keep intact all notices that refer to this License and to the disclaimer of warranties. You may not distribute the Executable Files or Source Code with any technological measures that control access or use of the Work in a manner inconsistent with the terms of this License.
Can I distribute the "Derivative Work" under a different license? And if yes, can I only license the files I modified or can I license the project as a whole?
Or does my new project have to be licensed under the CPOL?
Please note that I am modifying the project itself, and not linking it into another program, unlike in this question.
UPDATE: I've found a relevant question on Software Engineering Stack Exchange, however the answer "Contact the author or review the license with a lawyer" is not possible, as the author have abandoned this project for more than a decade (there have been prior questions about the license unanswered).