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porting, copyright e credits



salve a tutt,

voglio inserire in un programma GPL un algoritmo, prendendolo da un file
C++ e facendone il porting. il programma C++ contiene:

Copyright (C)...

Permission is  given by  the author to  freely redistribute  and include
this code in any program as long as this credit is given where due.

  COVERED  CODE 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  CODE  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 CODE IS WITH  YOU. SHOULD ANY COVERED CODE 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 CODE  IS AUTHORIZED HEREUNDER
  EXCEPT UNDER THIS DISCLAIMER.

  Use at your own risk!


due domande:

1) se faccio il porting da C++ a java o qualsiasi altro linguaggio, devo
considerarlo un'opera derivata, e quindi riportare la scritta? non è che
voglia rubare il  lavoro altrui, ci lascerei comunque  un commento tipo:
preso  dal  tal file  del  tizio, che  ringrazio,  etc.  che dite?  devo
lasciare l'intero commento?

2)  in un  programma GPL,  si  può inserire  una parte  con una  licenza
simile? come funzionano queste cose?

grazie

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