I do not quite understand what "user-visible display" in the following sentence in RPL (https://opensource.org/licenses/RPL-1.5) means:

d. User-Visible Attribution. You must duplicate any notice contained in EXHIBIT B (the "User-Visible Attribution Notice") in each user-visible display of the Licensed Software and Your Extensions which delineates copyright, ownership, or similar attribution information.

The RPL-covered "Licensed Software" I intend to use is a library given in form of a source code. My product would not redistribute the source code, the "Licensed Software" will be compiled into it and become "unseparable" from the rest of it. The "Licensed Software" provides some communication protocol functionality and is effectively hidden under multiple layers of other code. As far as I understand I am not creating extensions to it, so I believe that I have no "user-visible display of Your Extensions". (It is also interesting to note that "Your Extensions" are not defined anywhere in the license text).

In this case, do I have any "user-visible" display of the Licensed Software? Or is "user-visible display" intended to include indirect effects of using the Licensed Software - which is manifested only by the fact that my software would have some features that otherwise would not work?

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    Does the library you are using actually specify a notice for the EXHIBIT B section of the license? On the template you have shown, that is at the very bottom. The author should presumably write something after the first ":" contained in EXHIBIT B, otherwise it can be treated as blank (no notice). I know it's not really an answer, but if that part is blank, then at least for your case, you can ignore this issue as non-relevant for the library you are using. – Brandin Mar 16 '18 at 11:59
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    @Brandin: Yes, there is a notice under EXHIBIT B. – ZbynekZ Mar 16 '18 at 15:30
  • As far as I can tell, the "user-visible display [...] which delineates copyright, ownership, or similar attribution information" refers to what is commonly known as an "about"-screen/dialog. Also note that the RPL seems to be intended to be an even stronger copyleft license than the GPL. – Bart van Ingen Schenau Mar 16 '18 at 16:00
  • "each user-visible display" seems to imply multiple possible such displays. Not a very good license if it is so hard to use. – Brandin Mar 16 '18 at 19:11

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