Perlindungan hukum kreditur terhadap peralihan jaminan hak tanggungan dalam jual beli piutang melalui Cessie : studi kasus Putusan Pengadilan Negeri Nomor 79/Pdt.G/2019/PN Tab dan Putusan Peninjauan Kembali Nomor 754 PK/Pdt/2011 = Legal protection of creditor for the transfer of mortgage guarantees in the sale and purchase of receivables by using Cessie : study case Putusan Pengadilan Negeri Nomor 79/Pdt.G/2019/PN Tab and Putusan Peninjauan Kembali Nomor 754 PK/Pdt/2011