hip , ▁in ▁east - central ▁Poland . ▁It ▁lies ▁approximately ▁ ▁east ▁of ▁P ło ń sk ▁and ▁ ▁north - west ▁of ▁Wars aw . ▁ ▁The ▁village ▁has ▁a ▁population ▁of ▁ 1 8 0 . ▁ ▁References ▁ ▁Category : V ill ages ▁in ▁P ło ń sk ▁County <0x0A> </s> ▁S DE S ▁( Session ▁Description ▁Pro tocol ▁Security ▁Descri ptions ) ▁for ▁Media ▁Stream s ▁is ▁a ▁way ▁to ▁negoti ate ▁the ▁key ▁for ▁Sec ure ▁Real - time ▁Transport ▁Pro tocol . ▁It ▁has ▁been ▁proposed ▁for ▁standard ization ▁to ▁the ▁I ET F ▁in ▁July ▁ 2 0 0 6 ▁( see ▁R FC ▁ 4 5 6 8 .) ▁ ▁How ▁it ▁works ▁ ▁The ▁keys ▁are ▁transport ed ▁in ▁the ▁SD P ▁attachment ▁of ▁a ▁S IP ▁message . ▁That ▁means , ▁the ▁S IP ▁transport ▁layer ▁must ▁make ▁sure ▁that ▁no - one ▁else ▁can ▁see ▁the ▁attachment . ▁This ▁can ▁be ▁done ▁by ▁using ▁TLS ▁transport ▁layer , ▁or ▁other ▁methods ▁like ▁S / M IME . ▁Using ▁TLS ▁assumes ▁that ▁the ▁next ▁hop ▁in ▁the ▁S IP ▁proxy ▁chain ▁can ▁be ▁trust ed ▁and ▁it ▁will ▁take ▁care ▁about ▁the ▁security ▁requirements ▁of ▁the ▁request . ▁ ▁The ▁main ▁advantage ▁of ▁this ▁method ▁is ▁that ▁it ▁is ▁extremely ▁simple . ▁The ▁key ▁exchange ▁method ▁has ▁been ▁picked ▁up ▁by ▁several ▁vend ors ▁already , ▁even ▁though ▁some ▁vend ors ▁do ▁not ▁use ▁a ▁secure ▁mechanism ▁to ▁transport ▁the ▁key .