<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><font class="Apple-style-span" face="Verdana">Hi Andrzej,</font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana">Following your previous answer, let me try to clarify the use case.</font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana">USE CASE:</font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><span class="Apple-style-span" style="border-collapse: collapse; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><font class="Apple-style-span" face="Verdana">Suppose that a web site can find and show touristic pictures which have been taken in a selected area: </font></span></div><div><span class="Apple-style-span" style="border-collapse: collapse; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><font class="Apple-style-span" face="Verdana">- Some users can upload pictures to the web server, indicating the address where each picture has been taken, <br>- Some OTHER users can ask the web site to find and show the pictures which have been taken in the neighborhood of a provided address. <br><br>Notice that the web site does not show t</font></span><span class="Apple-style-span" style="border-collapse: collapse; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><font class="Apple-style-span" face="Verdana">o the OTHER users, </font></span><span class="Apple-style-span" style="border-collapse: collapse; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><font class="Apple-style-span" face="Verdana">the addresses of the pictures,</font></span></div><div><span class="Apple-style-span" style="border-collapse: collapse; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><font class="Apple-style-span" face="Verdana">since the privacy of the users who have uploaded the pictures has to be protected.</font></span></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana">PROBLEM:</font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana">According to the ODbL license, the derivative database containing the locations of the pictures has to be published.</font></div><div><font class="Apple-style-span" face="Verdana">This is a problem since the privacy of the </font><span class="Apple-style-span" style="border-collapse: collapse; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><font class="Apple-style-span" face="Verdana">users who have uploaded pictures is not protected anymore.</font></span></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana">POSSIBLE SOLUTION:</font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana">The only possible solution seems to be the solution Frederik described in a previous answer:</font></div><div><font class="Apple-style-span" face="Verdana">Dummy locations could be added to the derivative database, in order to mask the locations of the pictures.</font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><font class="Apple-style-span" face="Verdana"><br></font></div><div><b><font class="Apple-style-span" face="Verdana">MAIN QUESTION:</font></b></div><div><b><font class="Apple-style-span" face="Verdana"><br></font></b></div><div><span class="Apple-style-span" style="font-family: verdana, geneva, helvetica, arial, sans-serif; border-collapse: collapse; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; "><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><b><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;">Does the ODbL license allow to add dummy data into a derivative database </span></font></b></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><b><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;">in order to mask the useful data of the derivative database ?</span></font></b></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><b><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;"><br></span></font></b></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><b><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;">Otherwise, is there any other solution to protect the privacy ?</span></font></b></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;"><br></span></font></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;"><br></span></font></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;"><br></span></font></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;">Thank you very much for your help.</span></font></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;"><br></span></font></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;"><br></span></font></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;"><br></span></font></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><font class="Apple-style-span" face="Verdana" size="3"><span class="Apple-style-span" style="font-size: 12px;">Xavier</span></font></div><div style="border-top-color: rgb(204, 204, 204); border-right-color: rgb(204, 204, 204); border-bottom-color: rgb(204, 204, 204); border-left-color: rgb(204, 204, 204); "><br></div></span></div></body></html>