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 suchmodifications or work under the terms of Section 1 above, provided thatyou also meet all of these conditions:* a) You must cause the modified files to carry prominent notices statingthat you changed the files and the date of any change.* b) You must cause any work that you distribute or publish, that inwhole or in part contains or is derived from the Program or any partthereof, to be licensed as a whole at no charge to all third partiesunder the terms of this License.* c) If the modified program normally reads commands interactively whenrun, you must cause it, when started running for such interactiveuse in the most ordinary way, to print or display an announcementincluding an appropriate copyright notice and a notice that there isno warranty (or else, saying that you provide a warranty) and thatusers may redistribute the program under these conditions, andtelling the user how to view a copy of this License. (Exception: ifthe Program itself is interactive but does not normally print suchan announcement, your work based on the Program is not required toprint an announcement.)These requirements apply to the modified work as a whole. If identifiablesections of that work are not derived from the Program, and can bereasonably considered independent and separate works in themselves, thenthis License, and its terms, do not apply to those sections when youdistribute them as separate works. But when you distribute the samesections as part of a whole which is a work based on the Program, thedistribution of the whole must be on the terms of this License, whosepermissions for other licensees extend to the entire whole, and thus toeach and every part regardless of who wrote it.Thus, it is not the intent of this section to claim rights or contestyour rights to work written entirely by you; rather, the intent is toexercise the right to control the distribution of derivative orcollective works based on the Program.In addition, mere aggregation of another work not based on the Programwith the Program (or with a work based on the Program) on a volume of astorage or distribution medium does not bring the other work under thescope of this License.3. You may copy and distribute the Program (or a work based on it, underSection 2) in object code or executable form under the terms of Sections1 and 2 above provided that you also do one of the following:* a) Accompany it with the complete corresponding machine-readable sourcecode, which must be distributed under the terms of Sections 1 and 2above on a medium customarily used for software interchange; or,* b) Accompany it with a written offer, valid for at least three years,to give any third party, for a charge no more than your cost of