Please, no crippling "security features"
I would be appalled if the T5 material had some "security" features which compromised its usefulness.
I have most Traveller books in hard copy and softcopy - the softcopies are vastly more portable, and I can extract bits and customize them (e.g. change planet, character, ship names, etc.) as appropriate for my campaign / MTU.
I have no problem with watermarks; I even welcome them, as my friendly local game store might look askance at printed books without one...
I also have had the fun of transporting DriveThruRPG products between machines, and was very pleased when they made them available as unlocked watermarked files.
- Pop