Prawn is copyrighted free software produced by Gregory Brown along with community contributions. See git log for authorship information.
Licensing terms follow:
You can redistribute Prawn and/or modify it under either the terms of the GPLv2 or GPLv3 (see GPLv2 and GPLv3 files), or the conditions below:
1. You may make and give away verbatim copies of the source form of the software without restriction, provided that you duplicate all of the original copyright notices and associated disclaimers. 2. You may modify your copy of the software in any way, provided that you do at least ONE of the following: a) place your modifications in the Public Domain or otherwise make them Freely Available, such as by posting said modifications to Usenet or an equivalent medium, or by allowing the author to include your modifications in the software. b) use the modified software only within your corporation or organization. c) rename any non-standard executables so the names do not conflict with standard executables, which must also be provided. d) make other distribution arrangements with the author. 3. You may distribute the software in object code or executable form, provided that you do at least ONE of the following: a) distribute the executables and library files of the software, together with instructions (in the manual page or equivalent) on where to get the original distribution. b) accompany the distribution with the machine-readable source of the software. c) give non-standard executables non-standard names, with instructions on where to get the original software distribution. d) make other distribution arrangements with the author. 4. You may modify and include the part of the software into any other software (possibly commercial). 5. The scripts and library files supplied as input to or produced as output from the software do not automatically fall under the copyright of the software, but belong to whomever generated them, and may be sold commercially, and may be aggregated with this software. 6. THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.