Figure 1 issues

[podborski]

We noticed two issues with the figure 1:

The figure shows that the last tile signals tile_size_minus_1 as bytes of clear data, however the last tile never includes tile_size_minus_1 according to AV1 spec:

Second issue is on metadata encryption. The figure shows that metadata OBU is partially encrypted while in the spec we added the constraint that metadata OBUs shall not be protected.

[cconcolato]

What about this one:

[cconcolato]

The group reviewed the proposed image and the following additional changes should be made:

• Metadata should not be encrypted
• We could hint that the protected part of the N-1 tile is in the same range as the protected data for the last tile using "P..." and "...P" (as it is done for the clear part at the start of the OBU).

[cconcolato]

Done, also updated the note 1 to remove "& MD".