[Rd] Licensing concerns in porting S-Plus code to R libraries

From: Chris Green <christopher.g.green_at_gmail.com>
Date: Mon, 15 Oct 2012 17:38:23 -0700

I used S-Plus for many years, and developed lots of code for my research. When I switched to R a few years ago, I ported most of my S-Plus code over to R for my own use. Now that some of this code is quite polished, I would like to make it available as an R package on CRAN.

Some of my S-Plus code, however, was based on Insightful S-Plus functions; for instance, I took a Trellis function, and modified to suit my needs. In some cases the modifications are minor (e.g., adding extra functionality, changing colors), while in other cases I've made substantial changes (e.g., a new function that just uses the techniques of the internal function). Furthermore, in porting the code to R, I of course had to make further changes (e.g., Trellis functions for lattice/grid functions, new C code to replace internal S-Plus routines to which I did not have the source code).

I wondering if anyone can provide some guidance here as to what I can release without running afoul of any user agreement that may have come with S-Plus long ago. I'm assuming other package developers, especially those that were S-Plus users long ago, have encountered this issue and can advise me on what to do.

Many thanks,

Chris Green

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