Perlindungan kreditur sebagai pemegang hak tanggungan dalam surat kuasa membebankan hak tanggungan : studi kasus putusan Mahkamah Agung no. 1369K/Pdt/2009, no. 2209K/Pdt/2005, no. 610PK/Pdt/2002 = Protection of creditor as the holder of attorney imposing mortgage's right in attorney imposing mortgage case study of supreme court , verdict no. 1369K/Pdt/2009, no. 2209K/Pdt/2005, no. 610PK/Pdt/2002