User's Manual

128

You may charge a fee for the physical act of transferring a

copy, and you may at your option oer warranty protection in

exchange for a fee.

2. You may modify your copy or copies of the Program or any

portionofit,thusformingaworkbasedontheProgram,and

copyanddistributesuchmodicationsorworkunderthe

termsofSection1above,providedthatyoualsomeetallof

these conditions:

a) You must cause the modied les to carry prominent

notices stating that you changed the les and the date of any

change.

 b) Youmustcauseanyworkthatyoudistributeorpublish,that

in whole or in part contains or is derived from the Program or

anypartthereof,tobelicensedasawholeatnochargetoall

third parties under the terms of this License.

c) If the modied program normally reads commands

interactively when run, you must cause it, when started

running for such interactive use in the most ordinary way, to

print or display an announcement including an appropriate

else, saying that you provide a warranty) and that users may

redistribute

the program under these conditions, and telling the user how

to view a copy of this License. (Exception: if the Program itself is

interactivebutdoesnotnormallyprintsuchanannouncement,

yourworkbasedontheProgramisnotrequiredtoprintan

announcement.)