I have been messing with code in The Unix Archive and have found that most of the code references a (non existent) license, however, this is in the root of the mirrors and apparently covers all of the code (typed from a PDF, so excuse the typos): (source pdf is hereThe following copyright notice applies to the source code files for which the license is granted.Copyright(c) Caldera International Inc. 2001-20012. All rights  reserved Redistribution and use in source and binary forms, with or  without modification, are permitted provided that the following  conditions are met:Redistributions of source code and documentation  must retain the above copyright notice, this list of conditions, and  the following disclaimer. Redistributions in binary form must  reproduce the above copyright notice, this list of conditions and the  following disclaimer in teh docuemtnation and/or other materials  provided iwth the distribution.All advertising materials mentioning  features or use of this software must display the following  acknowledgement: This product includes software developed or owned by  Caldera International, inc. Neither the name of Caldera International,  Inc. nor the names of other contributors may be used to endorse or  promote products derived form this software without specific prior  written permission. USE OF THE SOFTWARE PROVIDED FOR UNDER THIS  LICENSE BY CALDERA INTERNATIONAL, INC. AND CONTRIBUTORS ''AS IN'' AND  NAY EXPRESS OR IMPLIED WARANTIES, INCLUDING, BUT NOT LIMITED TO, THE  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC.  BE LIABLE OFR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLRARAY,  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE  OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.Is this an open source license? It kind of seems to be very BSD-ish, with the exclusion of the clause all advertising materials mentioning features or use of this software must display the following acknowledgement: this product includes software developed or owned by Caldera International, IncDoes that clause prevent this from being an open source license?
Is this an open source license?
licensing;open source;legal