From my understanding (reading the "Serial ATA Revision 3.1 Specification") for a single lane cable; they can be:
A. cables can be what ever color they want.
B. "ClickConnect" is optional. (what everyone calls latches)
C. connector labeling is optional.
D.The cables/connectors meets the electrical characteristics requirements of the spec.
However, I am sure there may be vendors/manufacturers out there that turn out cables with SATA 6 Gb/s stamped all over them and they may not meet the spec of the Serial ATA International Organization.
This has nothing to do with the Serial ATA International Organization, but it's my view of cables... Cables should be stamp with the specs of the cable itself from the cable manufacturer (Except for the few who have specialized cable, but it should still be on the packaging or available).
So, you may want to check the specs of cables from the manufacturers you plan on getting them from to see if they fall into the proper specs.
And, I use the latch-less connectors in some areas that are hard to access quickly; or, if I have a need for tight spaces (I have found that an angled connector with no latch takes up less height than a latch one).
EDIT:
Says "Banned"... I would hazard a guess... that he is.