A Comparative Analysis of Information Hiding Techniques for Copyright Protection of Text Documents

Table 15

Embedding capacity analysis of structural techniques (bits per doc).

Algorithm name	Doc 1	Doc 2	Doc 3	Doc 4	Average; capacity	Summary of embedding methods (BPL)
Bender et al., 1996 [44]	73	74	5	42	49	One bit per locations (interword spaces, end of the lines and between sentences)
Lee and Tsai, 2008 [42]	210	210	6	117	135	3 bits per locations (interword spaces)
Cheng et al., 2010 [45]	852	840	948	480	781	12 bits per locations (word colors)
Chou et al., 2012 [46]	350	350	10	195	226	5 bits per locations (interword spaces)
Por et al., 2012 [22]	148	150	12	86	98	2 bits per locations (interword, intersentence, end-of-line, and end of paragraph)
Taleby Ahvanooey and Tabasi, 2014 [15]	6	28	20	14	17	2 bits per locations (after punctuation characters)
Taleby Ahvanooey et al., 2015 [16]	48	224	160	42	118	16 bits per locations (after punctuation characters, between sentences and beginning of the paragraphs)
Taleby Ahvanooey et al., 2016 [11]	120	180	120	180	150	Total bits of watermark string per locations (one time watermark bits after dots (.))
Alotaibi and Elrefaei, 2016 [19] (second)	280	280	8	156	181	4 bits per locations (interword spaces)