or more tiles that are not other non-in-picture predicted tiles to one or more tiles of the in- picture-prediction-enabled tile set. 58. An apparatus according to any of Claims 55 to 57, wherein the indication comprises a set of anchor positions for a set of intra block copy motion vectors of a set of dependent tiles in the in-picture-prediction-enabled tile set. 59. A computer program product comprises at least one non-transitory computer- readable storage medium having computer executable program code instructions stored therein, the computer executable program code instructions comprising program code instructions configured, upon execution, to: receiving a bitstream comprising a coded picture, the coded picture comprising one or more tiles; receiving an indication of an in-picture-prediction-enabled tile set, wherein the in- picture-prediction-enabled tile set identifies one or more dependent tiles from the one or more tiles, wherein the one or more dependent tiles are dependent on another dependent tile within a coded picture or form a logical atomic unit with another dependent tile; and decoding the bitstream according to the indication of the in-picture-prediction-enabled tile set. 60. A computer program product according to Claim 59 wherein the indication of the in-picture-prediction-enabled tile set is encoded in one or more of: a sequence parameter set associated with the bitstream, a picture parameter set associated with the bitstream, or a supplemental enhancement information message associated with the bitstream. 6 1. A computer program product according to Claim 60 wherein the indication indicates whether the in-picture-prediction-enabled tile set is a temporal motion-constrained tile set. 62. A computer program product according to any of Claims 60 to 6 1 wherein the indication comprises a dependency forest or graph that indicates a set of prediction dependencies for one or more tiles that are not other non-in-picture predicted tiles to one or more tiles of the in-picture-prediction-enabled tile set.