"PTHC" is a keyword commonly used to search for or identify child pornography on file sharing networks. see also: r@ygold, hussyfan, mclt, lolita)

The keyword has become sufficiently well-known that it is rarely used to identify actual child porn; most files with the keyword show legal but young looking performers in an attempt to attract individuals looking for child porn..

The Kazaa file-sharing software does not allow searches for the keyword, but it is allowed by eDonkey/eMule, Shareaza, Limewire, Bearshare, iMesh and WinMX.

It is sometimes speculated that "PTHC" stands for Preteen Hardcore.