I have a PIL library that is for images in Python. I am developing a desktop program that is for commercial purposes. However, I am not selling, I only offer voluntary donations to users. The PIL library is licensed under HPND license. It has some terms that say that without written permission I cannot even use the name of the copyright holder for advertising purposes. It also appears that the copyright notice must appear on all copies of the software.
Well, I don't know if to comply with this in the app I must license my app under the same license, because it asks that I leave a copyright notice on copies of the software. I have checked the library, and a copyright notice appeared in its code. The point is, it asks me to also leave the notice in the software documentation. The license states that I can modify, use, copy for any purpose, free of charge if those conditions are met.
I need help to understand how I can meet those license requirements. Is it required that I leave a file in my source code that says "copyright notice.txt" and it contains the PIL permission notice and its copyright notice? Is that enough to meet those requirements? When compiled into an exe, would the library code need to be duplicated? Do I comply with leaving a copyright notice in the main folder of my desktop app?
